Fertilization Tolerance of Maize on Purple Soil in Dry-hot Valley: Integrating Agronomic, Water Environmental and Economic Benefits

doi:10.11924/j.issn.1000-6850.casb16050083

Abstract

Abstract: This study used maize (Zea mays L.) as the experimental material, which was the typical crop in purple soil area, investigated the effects of varied fertilizer application levels, including no fertilizer, traditional fertilizer amount (CK, 750 kg/hm2), and 0.5, 1.5, 2.0 and 2.5 times of the traditional fertilizer amount, on crop yields, growth characteristics and NP loss in leaching solution and runoff by plot experiments in slop field cropland and indoor analysis. Based on experiments on NP in relation to fertilization application rate, a unified economic indicator and evaluation model for the coordination effect of agronomic, water environmental and economic benefits were studied. The results showed that when the fertilizer application amount was 0-1870 kg/hm2, the leaf area index increased fast in the earlier stage and declined slowly in the later stage, plant height and yield increased with the increase of fertilizer application levels from CK to 2.0 times of traditional fertilizer level, but declined under the 2.5 times of traditional fertilizer level. The total N and total P concentration in runoff and leaching solution increased with the increase of fertilizer application levels. By the evaluation model, the effects of the marginal yield and the nutrient rich of maize fertilizer were calculated, the range of fertilization tolerance was 1154-1176 kg/hm2.

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References

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