摘要
土壤供肥量是配方施肥中关键的参数,决定平衡施肥的精度。以田间试验所设的缺素区产量代替无肥区产量,所建立的定产式更逼近实际,增加土壤供肥量的计算量,减少施肥量。缺素区产量及其养分吸收量是计算土壤供肥量、土壤有效养分校正系数与相对产量等的基础参数。文中讨论的确定土壤供肥量的三种方法精度均较高,在两种作物、30个供肥指标中,吻合度大于90%的占96.7%。三种供肥方法均能使配方施肥建议施肥量达到定量水平。
A formula was established by the outputs of nutrient -- deficient plots instead of the CK plots, which is near to the natural conditions and lead to the increase of soil nutrient -- supplying potential but the decreaes of fertilization. The output and the amount of nutrient uptake at the nutrient deficient plots are the basic parameters for forecasting the soil nutrient -- supplying capacity and correcting the coefficients of available nutrients. The three methods discussed in the paper had higher precision in the forecast of soil nutrient -- supply. The fitting value was over 90%.
出处
《黑龙江农业科学》
2006年第4期44-49,共6页
Heilongjiang Agricultural Sciences
关键词
土壤供肥量
定产式
测土值
校正系数
有效养分
相对产量
soil nutrient--supplying
formula
soil nutrient
corrected coefficient
available nutrients
relative output
