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为建立最优水氮组合提供参考,设置4个氮肥处理、3个水分处理的大田试验,随机分组,分析了棉花不同水氮组合NDVI和棉花生长状况的差异性,建立以产量为因变量的水肥模型。结果表明,不同水氮组合的棉花冠层NDVI变化都呈“低-高-低”趋势。施氮量对棉花冠层NDVI的影响大于灌水;依据建立水氮效应的产量模型确定的最高施氮量和灌水量分别为298.47 kg/hm2和3 698.75 m3/hm2,理论棉花产量为6 597.02 kg/hm2。因此,合理的水氮组合既能减少水肥浪费,又能提高棉花产量。棉花冠层NDVI能够很好地反映棉花生长状况,可替代传统方法获取棉花生长指标。
In order to provide a reference for establishing optimum water-nitrogen combination, four nitrogen-fertilizer and three water-treatment field trials were set up and randomly divided into groups to analyze the differences of cotton growth and NDVI under different water and nitrogen combinations. Water and fertilizer model. The results showed that the NDVI of cotton canopy under different water and nitrogen combinations showed the trend of “low - high - low”. The effect of nitrogen rate on cotton canopy NDVI was greater than that of irrigation. The maximum nitrogen rate and irrigation rate were 298.47 kg / hm2 and 3 698.75 m3 / hm2, respectively, based on the yield model with water and nitrogen effect. The theoretical cotton yield was 6 597.02 kg / hm2. Therefore, a reasonable combination of water and nitrogen can reduce water and fertilizer waste, but also increase cotton production. Cotton canopy NDVI can well reflect the status of cotton growth, can replace the traditional methods to obtain cotton growth index.