ven_101c_2009_lecture_6_nutrients_3

ven_101c_2009_lecture_6_nutrients_3 -...

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SLIDES\VineBalance\UnifSymp98.ppt 1 David R. Smart VEN 101C 2009 Vineyard Nutrient Management drsmart@ucdavis.edu 2142 RMI North Monday 9:30 11:30 754 7143/754 7144 Opposite Cluster Petiole Sample at Bloom Nitrogen Nutrition 1) Nutrient required in greatest amounts (1.2 to 5% of leaf N). 2 Primary constituent of the amide bond AAs and 2) Primary constituent of the amide bond, AAs and proteins. 3) Primary consituent of 40% of leaf protein consists of RuBisco. 4) Photosynthesis/Nitrogen relation is positive. 5) Greatest limitation to yield and productivity in all crops. 6) Other functions: Tanins, phenolics, osmoticant, fermentation. Photosynthesis Nitrogen Relationship Decomposition : Organic-N AAs NH 4 + NH 4 + NO 2 NO 3 Ammonification Nitrification
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SLIDES\VineBalance\UnifSymp98.ppt 2 Litterfall Incorporation Organic-N AAs Ammonification NH 4 + Nitrification NO 3 - Denitrification 2NO 3 2NO 2 2NO N 2 O N 2 NR NiR NOR N 2 OR Litterfall Incorporation NH 3 , NO, N 2 O Organic-N AAs Ammonification NH 4 + NH 3 Nitrification NO 3 - Offsite Leaching tterfall Incorporation NH 3 , NO, N 2 O rganic-N AAs Ammonification NH 4 + NH 3 Nitrification NO 3 - Offsite Leaching Mineral Nitrogen Assimilation 2ATP 3ATP 7ATP Depends on: Light Transpiration rate Leaf age (at bloom) NO 3 NO 2 NH 4 + Glutamate NR NiR GS/GOGAT Cytoplasm Stroma Stroma Fertigation & Vigor
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SLIDES\VineBalance\UnifSymp98.ppt 3 Fermentation Dynamics Nitrogen Excess N source Form % N Amount for 20 lbs/A Comments Anhydrous ammonia NH 3 82% N 24 lbs can inject in drip system. .. more difficult to inject into soil Aqueous ammonia solution NH 3 OH 20% N 100 lbs (13.2 gals) easier to use with drip system, and to inject into soil Ammonium sulfate (NH 4 ) 2 SO 4 21% N 95 can increase soil acidity and need to be cautious about ammonium toxicity under low pH soils Ammonium nitrate NH 4 NO 3 33% N 61 rapid N utility of half NH4+-N may have slower release depending on CEC and soil pH Potassium Nitrate KNO 3 14% N 143 Common, especially where K fertility is major problem
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ven_101c_2009_lecture_6_nutrients_3 -...

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