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Position: Home > Articles > Responses of greenhouse tomato and pepper yields and nitrogen dynamics to applied compound fertilizers Pedosphere 2004,14 (2)

Responses of greenhouse tomato and pepper yields and nitrogen dynamics to applied compound fertilizers

作者：

Jinyan Zhu;X.L. Li;F.S. Zhang;J.L. Li;Peter Christi

单位：

School of Biological Science;-Hua, LI Xiao-Lin, ZHANG Fu-Suo, LI Jun-Liang and P

关键词：

ha;12;no3;n fertilizer;applied;n uptak

摘要：

Yield and N uptake of tomato (Lycopersicum esculentum Mill.) and pepper (Capsicum annuum L.) crops in five successive rotations receiving two compound fertilizers (12-12-17 and 21-8-11 N-P2O5-K2O) were studied to determine 1) crop responses, 2) dynamics of NO3-N and NH4-N in different soil layers, 3) N balance and 4) system-level N efficiencies. Five treatments (2 fertilizers, 2 fertilizer rates and a control), each with three replicates, were arranged in the study. The higher N fertilizer rate, 300 kg N ha(-1) (versus 150 kg N ha(-1)), returned higher vegetable fruit yields and total aboveground N uptake with the largest crop responses occurring for the low-N fertilizer (12-12-17) applied at 300 kg N ha(-1) rather than with the high-N fertilizer (21-8-11). Ammonium-N in the top 90 cm of the soil profile declined during the experiment, while nitrate-N remained at a similar level throughout the experiment with the lower rate of fertilizer N. At the higher rate of N fertilizer there was a continuous NO3-N accumulation of over 800 kg N ha(-1). About 200 kg N ha(-1) was applied with irrigation to each crop using NO3-contaminated groundwater. In general, about 50% of the total N input was recovered from all treatments. Pepper, relative to tomato, used N more efficiently with smaller N losses, but the crops utilized less than 29% of the fertilizer N over the two and a half-year period. Local agricultural practices maintained high residual soil nutrient status. Thus, optimization of irrigation is required to minimize nitrate leaching and maximize crop N recovery.

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Responses of greenhouse tomato and pepper yields and nitrogen dynamics to applied compound fertilizers

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