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The impacts of nitrogen (N) application rates on soil nitrate, electrical conductivity (EC), pH, soil N2O emission, tomato yield and fruit quality were investigated in a 20‐yr vegetable field experiment under greenhouse cultivation in Northeast China. The treatments included no N control (N0), the recommended N rate (N1; mean annual 300 kg/ha) and the commonly used N rate by farmers (N2; mean annual...
Producing optimal grain yields while reducing adverse environmental impacts of over‐fertilization is essential in intensive, but sustainable, farming systems. We investigated the effects of long‐term (1982–2005) application of chemical nitrogen (N), N + chemical phosphorus (P) and N + P + chemical potassium (K) on grain yield, nitrogen recovery efficiency (NRE) and N losses in two rice–wheat sites...
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