phosphorous and potassium

woodsmaneh!

woodsmaneh!

Well-Known Member
[FONT=&quot]OK I'll give in at 6.5 because it's OK for dirt, and lots of supporting references, but it does depend on what your trying to feed your plant as pointed out below. I posted thepH info first but the rest is intresting also, for a text book.
[/FONT]

​
[FONT=&quot]EFFECT OF pH[/FONT][FONT=&quot]
[/FONT][FONT=&quot]The pH determines solubility in the soil[/FONT][FONT=&quot]
[/FONT][FONT=&quot]1)[/FONT][FONT=&quot] more available at low pH (below 5.5), and less available at high pH. [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Fe, Zn, Cu, Mn, B [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2) more available at high pH (above 6.5), and less available at low pH.[/FONT][FONT=&quot]
[/FONT][FONT=&quot] N, K, Mg, Ca, S, Mo [/FONT][FONT=&quot]
[/FONT][FONT=&quot]3)[/FONT][FONT=&quot] more available at intermediate pH (6-7) [/FONT][FONT=&quot]
[/FONT][FONT=&quot] P [/FONT]
[FONT=&quot]Ideal pH[/FONT][FONT=&quot]
[/FONT][FONT=&quot]slightly acid:[/FONT][FONT=&quot]
[/FONT][FONT=&quot]a)[/FONT][FONT=&quot] around 6.5 for field soil [/FONT][FONT=&quot]
[/FONT][FONT=&quot]b)[/FONT][FONT=&quot] around 5.5-6.0 for artificial growing media made with peat moss or composted bark[/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot]ESSENTIAL ELEMENTS, MOBILITY AND pH EFFECT[/FONT]​
[FONT=&quot]essential element[/FONT][FONT=&quot] - an element required by plants for normal growth, development and completion[/FONT][FONT=&quot]
[/FONT][FONT=&quot] of its life cycle, and which cannot be substituted for by other chemical[/FONT][FONT=&quot]
[/FONT][FONT=&quot] compounds.[/FONT]
[FONT=&quot]17 ELEMENTS ARE REQUIRED BY PLANTS[/FONT][FONT=&quot]
[/FONT][FONT=&quot] 3 supplied naturally by air and water - comprise the bulk of the plant [/FONT][FONT=&quot]
[/FONT][FONT=&quot] C, H, 0 [/FONT][FONT=&quot]
[/FONT][FONT=&quot] 6 macronutrients[/FONT][FONT=&quot] - required at 0.1 to 6% of the dry weight of plants [/FONT][FONT=&quot]
[/FONT][FONT=&quot] N, P, K, S, Ca, Mg [/FONT][FONT=&quot]
[/FONT][FONT=&quot] 8 micronutrients[/FONT][FONT=&quot]- required at 1 to 300 ppm of the dry weight of plants [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Fe, Zn, Cu, Mo, B, Mn, Cl, Ni [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Cl and Ni are ubiquitous - hence, will not be addressed in detail [/FONT]
[FONT=&quot]The essential elements can be easily remembered by a catch phrase such as [/FONT][FONT=&quot]
[/FONT][FONT=&quot]C[/FONT][FONT=&quot]. HOPKiNS CaFe, CuB, Mn, C.l. MoNiZnsky, Mgr[/FONT][FONT=&quot]
[/FONT]
[FONT=&quot]NUTRIENT MOBILITY[/FONT][FONT=&quot]
[/FONT][FONT=&quot]Two directions of movement in plants[/FONT][FONT=&quot]
[/FONT][FONT=&quot]1)[/FONT][FONT=&quot] acropetal[/FONT][FONT=&quot] - means towards the apex; transport up the in xylem [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] basipetal [/FONT][FONT=&quot]- means towards the base; transport down in the phloem [/FONT]
[FONT=&quot]Two classifications of nutrient mobility [/FONT][FONT=&quot]
[/FONT][FONT=&quot]1)[/FONT][FONT=&quot] mobile [/FONT][FONT=&quot]- moves both up and down the plant by both acropetal and basipetal transport (in both [/FONT][FONT=&quot]
[/FONT][FONT=&quot] the xylem and the phloem). [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Deficiency appears on older leaves first. [/FONT][FONT=&quot]
[/FONT][FONT=&quot] N, P, K, Mg, S [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] immobile[/FONT][FONT=&quot]- moves up the plant by only acropetal (in the xylem) transport [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Deficiency appears on new leaves first. [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Ca, Fe, Zn, Mo, B, Cu, Mn[/FONT][FONT=&quot]
[/FONT][FONT=&quot]
[/FONT]
[FONT=&quot]EFFECT OF pH[/FONT][FONT=&quot]
[/FONT][FONT=&quot]The pH determines solubility in the soil[/FONT][FONT=&quot]
[/FONT][FONT=&quot]1)[/FONT][FONT=&quot] more available at low pH (below 5.5), and less available at high pH. [/FONT][FONT=&quot]
[/FONT][FONT=&quot] Fe, Zn, Cu, Mn, B [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2) more available at high pH (above 6.5), and less available at low pH.[/FONT][FONT=&quot]
[/FONT][FONT=&quot] N, K, Mg, Ca, S, Mo [/FONT][FONT=&quot]
[/FONT][FONT=&quot]3)[/FONT][FONT=&quot] more available at intermediate pH (6-7) [/FONT][FONT=&quot]
[/FONT][FONT=&quot] P [/FONT]
[FONT=&quot]Ideal pH[/FONT][FONT=&quot]
[/FONT][FONT=&quot]slightly acid:[/FONT][FONT=&quot]
[/FONT][FONT=&quot]a)[/FONT][FONT=&quot] around 6.5 for field soil [/FONT][FONT=&quot]
[/FONT][FONT=&quot]b)[/FONT][FONT=&quot] around 5.5-6.0 for artificial growing media made with peat moss or composted bark[/FONT]

[FONT=&quot]FERTILIZER ANALYSIS AND RATIO[/FONT]​
[FONT=&quot]FERTILIZER ANALYSIS[/FONT][FONT=&quot]
[/FONT][FONT=&quot]analysis[/FONT][FONT=&quot] - sequence of 3 numbers on the fertilizer label that gives the percent composition of [/FONT][FONT=&quot]
[/FONT][FONT=&quot] N-P205-K20 in a fertilizer; required by law to be on the label of every fertilizer sold. [/FONT]
[FONT=&quot]Example: 8-8-8 means the fertilizer contains:[/FONT][FONT=&quot]
[/FONT][FONT=&quot]8% N [/FONT][FONT=&quot]
[/FONT][FONT=&quot]8% P205 [/FONT][FONT=&quot]
[/FONT][FONT=&quot]8% [/FONT][FONT=&quot]K20 [/FONT][FONT=&quot]
[/FONT][FONT=&quot]24% total nutrient content [/FONT]
[FONT=&quot] Buy fertilizers by price per pound of fertilizer, not price per bag.[/FONT]​
[FONT=&quot]100 lb. of 8-8-8 @ $4.99
[/FONT][FONT=&quot]100 lb. @ 24% = 24 lb. of nutrients
@ $4.99 = 20.8 cents per lb[/FONT]​
[FONT=&quot]100 lb. of 13-13-13 @ $5.99
[/FONT][FONT=&quot]100 lb @ 39% = 39 lb. of nutrients
@ $5.99 = 15.3 cents per lb.[/FONT]​
[FONT=&quot]
[/FONT][FONT=&quot]FERTILIZER RATIO[/FONT][FONT=&quot]
[/FONT][FONT=&quot]ratio[/FONT][FONT=&quot] - the relative proportion of N to P205 to K20 in a fertilizer.[/FONT]
[FONT=&quot]Analysis
[/FONT][FONT=&quot]8-8-8
20-20-20
10-20-10
18-6-12[/FONT]​
[FONT=&quot]Ratio
[/FONT][FONT=&quot]1-1-1
1-1-1
1-2-1
3-1-2[/FONT]​
[FONT=&quot]
[/FONT][FONT=&quot]USING FERTILIZER RATIOS TO MANIPULATE GROWTH[/FONT][FONT=&quot]
[/FONT][FONT=&quot]a)[/FONT][FONT=&quot] to favor vegetative growth [/FONT]

  • [FONT=&quot]use a high N, low P and K fertilizer[/FONT]
  • [FONT=&quot]for example, use a 2-1-1 or 3-1-1 ratio fertilizer (higher 1st number) [/FONT]
[FONT=&quot]b)[/FONT][FONT=&quot] to favor flowering, root and underground storage organ growth [/FONT]

  • [FONT=&quot]use a low N, high P and/or K fertilizer[/FONT]
  • [FONT=&quot]for example, use a 1-2-2 or 1-3-2 ratio fertilizer (higher 2nd and/or 3rd number) [/FONT]




[FONT=&quot]FUNCTION OF NUTRIENTS[/FONT]​
[FONT=&quot]Nutrient[/FONT]
[FONT=&quot] Symbol[/FONT]
[FONT=&quot]Function[/FONT]
[FONT=&quot]nitrogen[/FONT]
[FONT=&quot]N[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Component of chlorophyll; amino acids, proteins and enzymes; [/FONT][FONT=&quot]
[/FONT][FONT=&quot] nucleic acids (RNA and DNA); some auxins and cytokinins. [/FONT]
[FONT=&quot]phosphorus[/FONT]
[FONT=&quot]P[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Component of the high energy compounds ATP, NADPH and [/FONT][FONT=&quot]
[/FONT][FONT=&quot] NADP; nucleic acids (DNA and RNA); and phospholipids. [/FONT]
[FONT=&quot]potassium[/FONT]
[FONT=&quot]K[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Needed for protein and enzyme synthesis and activation. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Involved in maintaining proper water balance [/FONT][FONT=&quot]
[/FONT][FONT=&quot]3)[/FONT][FONT=&quot] Needed for photosynthesis. [/FONT]
[FONT=&quot]magnesium[/FONT]
[FONT=&quot]Mg[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Component of chlorophyll. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Activates many enzymes. [/FONT]
[FONT=&quot]calcium[/FONT]
[FONT=&quot]Ca[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Ca pectates in middle lamella of cell wall cement cells together. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Required for normal cell division and meristem growth. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]3)[/FONT][FONT=&quot] Stabilizes membranes[/FONT]
[FONT=&quot]sulfur[/FONT]
[FONT=&quot]S[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Component of several amino acids (methionine, cystine,
cysteine).[/FONT]
[FONT=&quot]iron[/FONT]
[FONT=&quot]Fe[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Required for chlorophyll synthesis. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Component of many enzymes and carriers, especially those of [/FONT][FONT=&quot]
[/FONT][FONT=&quot] electron transport chain.[/FONT]
[FONT=&quot]zinc[/FONT]
[FONT=&quot]Zn[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Required for tryptophan, hence auxin (IAA), synthesis.[/FONT]
[FONT=&quot]manganese[/FONT]
[FONT=&quot]Mn[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Required for chlorophyll synthesis. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Activates many enzymes.[/FONT]
[FONT=&quot]copper[/FONT]
[FONT=&quot]Cu[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Required for chlorophyll synthesis. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Component of many enzymes and carriers, especially those of [/FONT][FONT=&quot]
[/FONT][FONT=&quot] electron transport chain.[/FONT]
[FONT=&quot]boron[/FONT]
[FONT=&quot]B[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Required for complete flowering and fruit development. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Involved in translocation of carbohydrates and hormones. [/FONT]
[FONT=&quot]molybdenum[/FONT]
[FONT=&quot]Mo[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Component of enzymes in N metabolism (nitrate to organic N) [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Component of enzymes in nitrogen fixation (N gas to ammonia)[/FONT]
[FONT=&quot]chlorine[/FONT]
[FONT=&quot]Cl[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Oxygen evolution in photosynthesis [/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot] Stomatal functioning [/FONT]
[FONT=&quot]nickel[/FONT]
[FONT=&quot]Ni[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Component of several enzymes, especially urease (breaks
down urea)[/FONT]









[FONT=&quot]TISSUE CONCENTRATION, DEFICIENCY SYMPTOMS AND FERTILIZER SOURCES[/FONT]​
[FONT=&quot]Nutrient[/FONT]
[FONT=&quot]Tissue Concentration[/FONT]​
[FONT=&quot]Characteristic Deficiency Symptom[/FONT][FONT=&quot]*[/FONT]​
[FONT=&quot]Fertilizer Sources[/FONT]
[FONT=&quot]
[/FONT][FONT=&quot]MACRONUTRIENTS[/FONT]​
[FONT=&quot]N[/FONT]​
[FONT=&quot]2-6%[/FONT]​
[FONT=&quot]older leaves - overall chlorosis[/FONT]
[FONT=&quot]NH4 nitrate, sulfate, phosphate; [/FONT][FONT=&quot]
[/FONT][FONT=&quot]K, Na, or Ca nitrate; urea [/FONT]
[FONT=&quot]P[/FONT]​
[FONT=&quot]0.2-1.2%[/FONT]​
[FONT=&quot]older leaves - deep green, purple coloration of petioles[/FONT]
[FONT=&quot]superphosphate; NH4 or K phosphate; phosphoric acid [/FONT]
[FONT=&quot]K[/FONT]​
[FONT=&quot]1-6%
(luxury
consumption)[/FONT]​
[FONT=&quot]older leaves - interveinal chlorosis with marginal and tip necrosis[/FONT]
[FONT=&quot]K nitrate, chloride, phosphate, or sulfate; K frit [/FONT]
[FONT=&quot]Mg[/FONT]​
[FONT=&quot] 0.2-1%[/FONT]​
[FONT=&quot]older leaves - interveinal chlorosis and bronze coloration[/FONT]
[FONT=&quot]dolomite (Ca/Mg carbonate), [/FONT][FONT=&quot]
[/FONT][FONT=&quot]Mg sulfate (Epsom salt)[/FONT]
[FONT=&quot]Ca[/FONT]​
[FONT=&quot]0.5-2% [/FONT]​
[FONT=&quot]stem tips - die, small leaves[/FONT]
[FONT=&quot]limes (Ca carbonate/hydroxide); [/FONT][FONT=&quot]
[/FONT][FONT=&quot]Ca sulfate (gypsum) or nitrate; [/FONT][FONT=&quot]
[/FONT][FONT=&quot]superphosphate[/FONT]
[FONT=&quot]S[/FONT]​
[FONT=&quot]0.3-0.7%[/FONT]​
[FONT=&quot]all leaves overall chlorosis, on young leaves 1st then progresses to old leaves[/FONT]
[FONT=&quot]sulfate carriers; elemental S; [/FONT][FONT=&quot]
[/FONT][FONT=&quot]air pollution; superphosphate[/FONT]
[FONT=&quot]
[/FONT][FONT=&quot]MICRONUTRIENTS**[/FONT]​
[FONT=&quot]Fe[/FONT]​
[FONT=&quot]50-300 ppm[/FONT]​
[FONT=&quot]young leaves - severe interveinal chlorosis [/FONT]
[FONT=&quot]Fe chelate; Fe sulfate; some pesticides [/FONT]
[FONT=&quot]Zn[/FONT]​
[FONT=&quot]5-75 ppm[/FONT]​
[FONT=&quot]new growth - rosetted growth & small leaves[/FONT]
[FONT=&quot]Zn chelate; Zn sulfate; [/FONT][FONT=&quot]
[/FONT][FONT=&quot]some pesticides[/FONT]
[FONT=&quot]Mn[/FONT]​
[FONT=&quot]30-300 ppm[/FONT]​
[FONT=&quot]young leaves - interveinal chlorosis with necrosis when severe[/FONT]
[FONT=&quot]Mn chelate; Mn sulfate; [/FONT][FONT=&quot]
[/FONT][FONT=&quot]some pesticides[/FONT]
[FONT=&quot]Cu[/FONT]​
[FONT=&quot]5-30 ppm[/FONT]​
[FONT=&quot]stem tips - die, stunted; leaves small; multiple buds formed[/FONT]
[FONT=&quot]Cu chelate; Cu sulfate; [/FONT][FONT=&quot]
[/FONT][FONT=&quot]some pesticides[/FONT]
[FONT=&quot]B[/FONT]​
[FONT=&quot]30-200 ppm[/FONT]​
[FONT=&quot]stem tips - internodes short, thick; leaves thick, brittle, with necrosis[/FONT]
[FONT=&quot]borax; boric acid[/FONT]
[FONT=&quot]Mo[/FONT]​
[FONT=&quot]1 ppm[/FONT]​
[FONT=&quot]similar to N deficiency, except occurs on young leaves.[/FONT]
[FONT=&quot]Na or NH4 molybdate [/FONT]
[FONT=&quot]Cl[/FONT][FONT=&quot] &[/FONT][FONT=&quot]Ni[/FONT]​
[FONT=&quot]?[/FONT]​
[FONT=&quot]virtually never seen in nature[/FONT]
[FONT=&quot]ubiquitous[/FONT]
[FONT=&quot]*chlorosis[/FONT][FONT=&quot] = yellowing; necrosis = browning; interveinal = between the veins [/FONT][FONT=&quot]
[/FONT][FONT=&quot]**micronutrients[/FONT][FONT=&quot] are often applied as a multi-micronutrient mix; ex. STEM, PERK, Micromax[/FONT]



[FONT=&quot]NUTRIENTS WITH SIMILAR DEFICIENCY SYMPTOMS[/FONT]​

[FONT=&quot]Nutrients That Cause Interveinal Chlorosis[/FONT]​

[FONT=&quot]Deficiency Of[/FONT]​
[FONT=&quot]Interveinal Chlorosis Occurs On[/FONT]​
[FONT=&quot]With No Necrosis[/FONT]​
[FONT=&quot]Plus Necrosis[/FONT]​
[FONT=&quot]Young Leaves[/FONT]​
[FONT=&quot]Fe[/FONT]​
[FONT=&quot]Mn[/FONT]​
[FONT=&quot]Old Leaves[/FONT]​
[FONT=&quot]Mg[/FONT]​
[FONT=&quot]K[/FONT]​

[FONT=&quot]Nutrients That Cause Overall Chlorosis[/FONT]​
[FONT=&quot]Overall Chlorosis Occurs on[/FONT]​
[FONT=&quot]Deficiency Of[/FONT]​
[FONT=&quot]Old Leaves[/FONT]​
[FONT=&quot]N[/FONT]​
[FONT=&quot]New Leaves[/FONT]​
[FONT=&quot]Mo[/FONT]​
[FONT=&quot]New Leaves, Then Spreading to Old Leaves[/FONT]​
[FONT=&quot]S[/FONT]​

[FONT=&quot]Nutrients That Effect the Shoot Tip[/FONT]​
[FONT=&quot]Various Deficiency Symptoms
on Growing Point, Emerging Leaves or[/FONT][FONT=&quot]Shoot Tip [/FONT]​
[FONT=&quot]Deficiency Of[/FONT]​
[FONT=&quot]Small New Leaves and Rosetted New Growth[/FONT]​
[FONT=&quot]Zn[/FONT]​
[FONT=&quot]Thick and Brittle New Leaves[/FONT]​
[FONT=&quot]B[/FONT]​
[FONT=&quot]New Leaves Distorted and Necrotic[/FONT]​
[FONT=&quot]Ca[/FONT]​
[FONT=&quot]Vague Symptoms: New Leaves Small, Wilted, Translucent or Necrotic[/FONT]​
[FONT=&quot]Cu[/FONT]​













[FONT=&quot]NITROGEN CYCLE[/FONT]​
[FONT=&quot]
[/FONT]​
[FONT=&quot]WAYS IN WHICH NITROGEN IS LOST FROM THE SOIL[/FONT][FONT=&quot]
[/FONT][FONT=&quot]1) [/FONT][FONT=&quot]leaching[/FONT][FONT=&quot] (especially nitrate which is negatively charged)[/FONT][FONT=&quot]
[/FONT][FONT=&quot]2)[/FONT][FONT=&quot]plant absorption[/FONT][FONT=&quot]
[/FONT][FONT=&quot]3)[/FONT][FONT=&quot]microorganisms consume[/FONT][FONT=&quot] (see C:N ratio next page)[/FONT][FONT=&quot]
[/FONT][FONT=&quot]4)[/FONT][FONT=&quot] denitrification[/FONT]






[FONT=&quot]NITROGEN CONVERSIONS[/FONT]​
[FONT=&quot]NITROGEN REACTIONS[/FONT][FONT=&quot]
[/FONT][FONT=&quot]mineralization [/FONT][FONT=&quot]or[/FONT][FONT=&quot] ammonification [/FONT][FONT=&quot]-the conversion of organic nitrogen (in the -NH2 form) to[/FONT][FONT=&quot]
[/FONT][FONT=&quot] inorganic nitrogen (in the NH4 form).[/FONT][FONT=&quot]
[/FONT][FONT=&quot] - the speed of conversion depends on the C:N ratio (see below).[/FONT][FONT=&quot]
[/FONT][FONT=&quot]nitrification [/FONT][FONT=&quot]- [/FONT][FONT=&quot]a two step process converting ammonium to nitrite, then nitrite to nitrate.[/FONT][FONT=&quot]
[/FONT][FONT=&quot] - the soil bacterium Nitrosomonas converts ammonium to nitrite[/FONT][FONT=&quot]
[/FONT][FONT=&quot] - the soil bacterium Nitrobacter converts nitrite to nitrate[/FONT][FONT=&quot]
[/FONT][FONT=&quot] - this occurs very quickly so little ammonium (which can be toxic if high) and[/FONT][FONT=&quot]
[/FONT][FONT=&quot] virtually no nitrite (which is highly toxic) accumulates in the soil.[/FONT][FONT=&quot]
[/FONT][FONT=&quot]denitrification[/FONT][FONT=&quot] - the conversion of nitrate in the soil to gaseous nitrogen that escapes into the[/FONT][FONT=&quot]
[/FONT][FONT=&quot] atmosphere.[/FONT]
[FONT=&quot]nitrogen fixation[/FONT][FONT=&quot] - the conversion of gaseous nitrogen to ammonia.[/FONT][FONT=&quot]
[/FONT][FONT=&quot] - only nitrogen fixing microorganisms can cause nitrogen fixation; [/FONT][FONT=&quot]
[/FONT][FONT=&quot] some form symbiotic relationships with plants (see table below)[/FONT][FONT=&quot]
[/FONT]
[FONT=&quot]CARBON:NITROGEN (C:N) RATIOS IN ORGANIC MATTER[/FONT][FONT=&quot]
[/FONT][FONT=&quot]C:N[/FONT][FONT=&quot] Ratio - proportion of carbon to nitrogen present in organic matter. [/FONT][FONT=&quot]
[/FONT][FONT=&quot]a)[/FONT][FONT=&quot] high C:N ratio- wood, sawdust, uncomposted bark [/FONT][FONT=&quot]
[/FONT][FONT=&quot] - microbes use up all nitrogen in organic matter when consuming carbon, [/FONT][FONT=&quot]
[/FONT][FONT=&quot] - then the microbes use up the nitrogen in the soil [/FONT][FONT=&quot]
[/FONT][FONT=&quot]b)[/FONT][FONT=&quot] low C:N ratio - manure, bone meal, fish emulsion, organic fertilizers [/FONT][FONT=&quot]
[/FONT][FONT=&quot] - microbes consume carbon, [/FONT][FONT=&quot]
[/FONT][FONT=&quot] - then release excess nitrogen from the organic matter into the soil [/FONT][FONT=&quot]
[/FONT][FONT=&quot] - thus, low C:N organic matter acts as an organic nitrogen fertilizer[/FONT][FONT=&quot]
[/FONT][FONT=&quot]
[/FONT]
[FONT=&quot]MICROORGANISMS THAT CAN FIX NITROGEN[/FONT]
[FONT=&quot]Type Microorganism[/FONT]
[FONT=&quot]Nitrogen-Fixing
Microorganism[/FONT]​
[FONT=&quot]Forms Symbiotic
Relationship With[/FONT]​
[FONT=&quot]1)[/FONT][FONT=&quot] Bacteria [/FONT]
[FONT=&quot]Rhizobium[/FONT]​
[FONT=&quot]Legumes
(soybean, clover, mesquite)[/FONT]​
[FONT=&quot]2)[/FONT][FONT=&quot] Bacteria[/FONT]
[FONT=&quot]Azotobacter
Clostridium[/FONT]​
[FONT=&quot]free living only[/FONT]​
[FONT=&quot]3)[/FONT][FONT=&quot] Filamentous Bacteria[/FONT]
[FONT=&quot]some Actinomycetes[/FONT]​
[FONT=&quot]Some woody plants,
(Alnus and Elaeagnus)[/FONT]​
[FONT=&quot]
4)[/FONT][FONT=&quot] Blue-green algae[/FONT][FONT=&quot]
[/FONT]
[FONT=&quot]Anabaena[/FONT]​
[FONT=&quot]Azolla[/FONT][FONT=&quot] and Cycads
(can also be free living)[/FONT]​
 
potroast

potroast

Uses the Rollitup profile
Thanks for that, woodsman. It depends on what plants you are growing, but for cannabis it's on the acid side of neutral. I guess that's why cannabis is referred to as acid-loving.
 
You must log in or register to reply here.
Top