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Residual effect of nitrogen fertilizers on the economic, energy and nitrogen balances of subsequent crop fertilization. Theoretical analysis of the problem and experimental results


, : Residual effect of nitrogen fertilizers on the economic, energy and nitrogen balances of subsequent crop fertilization. Theoretical analysis of the problem and experimental results. Annales Agronomiques 30(4): 305-322

The residual effects of N fertilizers are discussed. In field trials at Toulouse maize was grown in 1977 with 150 or 300 kg N/ha applied at sowing. In 1978 durum wheat Durtal was grown on the same plots with 0, 70, 140 or 210 kg N/ha applied in split applications. Wheat grain yields without N were 0.43 t/ha in areas which were not cultivated in 1977, 1.13 t/ha on plots which received 150 kg N/ha before the maize crop and 1.86 t/ha on plots with 300 kg N/ha before the maize crop.

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