Timing of N fertilization on N2 fixation, N recovery and soil profile nitrate dynamics on sorghum/pigeonpea intercrops on Alfisols on the semi-arid tropics

Cropping systems and fertilizer management strategies that effectively use applied nitrogen (N) are important in reducing costs of N inputs. We examined the effect of time of N application on dry matter (DM) and grain yield (GY), N accumulation, the N budget in crop from soil, fertilizer and atmosph...

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Published in:Nutrient cycling in agroecosystems 1997-05, Vol.48 (3), p.197-208
Main Authors: Adu-Gyamfi, Joseph J, Ito, O, Yoneyama, T, Devi, Gayatri, Katayama, K
Format: Article
Language:English
Subjects:
Accumulation
Agricultural economics
Agricultural practices
Aridity
Crop yield
Cropping systems
Crops
Depletion
Dilution
Dry matter
Fertilization
Fertilizers
Growth stage
Intercropping
Isotope dilution method
Nitrogen
Nitrogen fixation
Nitrogen isotopes
Nitrogenation
Pigeonpeas
Planting
Recovery
Soil dynamics
Soil profiles
Soil properties
Soil solution
Soils
Sole cropping
Sorghum
System effectiveness
Tropical environments
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Summary:Cropping systems and fertilizer management strategies that effectively use applied nitrogen (N) are important in reducing costs of N inputs. We examined the effect of time of N application on dry matter (DM) and grain yield (GY), N accumulation, the N budget in crop from soil, fertilizer and atmosphere, and the fertilizer N use efficiency (estimated by the conventional difference method, and the direct 15N recovery by the crops), in a sorghum/pigeonpea intercropping system on an Alfisol (Ferric Luvisols (FAO); or Udic Rhodustalf (USDA) in India. Fertilizer N was applied at planting (basal) and at 40 days after sowing (delayed). Nitrogen was applied only to the sorghum rows in the intercropping treatment. Nitrogen derived from air (Ndfa) was estimated by the15 N natural abundance method, and N derived from fertilizer (Ndff) was estimated by the 15N isotope dilution method.Delaying N fertilization till 40 days after sowing (DAS), rather than applying at sowing increased DM and GY of the sorghum, but not of pigeonpea. Delaying N fertilization to sorghum for 40 days significantly (p
ISSN:1385-1314
1573-0867
DOI:10.1023/A:1009788818738