Abstract
The influence of N, P and K application through inorganic and organic fertilizers on N recovery in crop plants and its balance in the soil-plant (maize-wheat-cowpea fodder) was studied for the first 22 years of a long-term experiment at Punjab Agricultural University farm, Ludhiana, India. The results showed. that N removal and apparent N recovery by both maize and wheat was directly related to the balanced application of N, P and K fertilizers. Averaged over the years, application of N alone (100% N) resulted in a recovery of 17.1% in maize and 31.7% in wheat. The application of P and K along with N almost doubled (32.8% in maize and 64.7% in wheat) the apparent N recovery in the crops. Increase in soil N concentration which was related to the build-up of soil organic carbon (OC) occurred at a very slow rate with the application of N, P and K fertilizers. Addition of farm yard manure (FYM) resulted in highest N removal in crops and build-up of soil N and OC status. Application of recommended N without P and K fertilizers resulted in relatively large amounts (64–71%) of fertilizer N lost from the surface soil as compared to that (41–49%) with N, P and K applied together. Higher rate of fertilizer application (150% NPK) resulted in comparatively greater N loss (58–62%). It was concluded that balanced and judicious use of N, P and K fertilizers coupled with the addition of any deficient element (e.g. Zn) help in minimizing N losses and environmental pollution.
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Benbi, D.K., Biswas, C.R. Nitrogen balance and N recovery after 22 years of maize-wheat-cowpea cropping in a long-term experiment. Nutr Cycl Agroecosyst 47, 107–114 (1996). https://doi.org/10.1007/BF01991542
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DOI: https://doi.org/10.1007/BF01991542