稻田变量施肥作业图的形成与施肥模型应用
Mapping of variable rate fertilizing and model of fertilizer application in paddy field
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摘要: 对130hm2弱碱性壤质水稻田的土壤养分空间变异进行研究，将田块划分为75m×75m的网格，采用DGPs定位取0～20cm 表层土样281个，应用地统计学的方法对测定数据进行分析结果表明，土壤有机质、水解氮、有效磷和有效钾等养分的空间分异特性有明显差异，75m 的取样间距较好地反映土壤养分的空间变异状况。利用土壤养分丰缺判断指标和结合Kriging内插法，绘制出养分的空间分异等值线图，并建立N、P、K 肥变量施用的数学模型。水稻施肥试验产量稳定保持在8250～9000kg／hm2。Abstract: To obtain basic information for variable rate fertilizer for rice production， spatial variability of soil chemical properties is evaluated in a slight alkaline paddy field of approximate 130hm2．Two hundred and eighty-one surface soil samples(0～20cm)are collected from each of the 75m × 75m plots after harvest to investigate the spatial variability of their chemical properties such as organic matter， hydrolysis nitrogen，available phosphorus， and available potassium．Geostatistical analysis is carried out to examine within-field spatial variability using kriged maps and the contour maps of soil nutrients are charted．Mathematic model of variable rate fertilizing is established according to the criterion of soil nutrient，function of fertilizer and yield of paddy．The experiment shows that the yield of paddy can be stably retained in 8250～9000kg／hm2 by the adopted variable rate fertilizing.
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Keywords:
- Paddy field /
- Variable rate fertilizing /
- Contour map /
- Mathematic model
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