华北太行山前平原土壤肥力状况与玉米产量相关关系的通径分析

采用通径分析方法研究了影响玉米产量主要因素之间的相互关系,剖析了各因素对提高玉米产量的相对重要性。结果表明,氮素是影响玉米产量的最重要因素,氮肥、土壤碱解氮主要通过直接作用影响玉米产量,其直接通径系数分别为0.535和0.332;磷肥、土壤速效磷的直接作用很弱,其直接通径系数分别为0.142和-0.043,磷肥主要通过与氮肥的交互作用来实现其增产效果,其间接通径系数为0.280,速效磷则主要通过碱解氮间接起到增产作用;速效钾的直接增产作用也很弱,其直接通径系数仅为0.038,主要通过碱解氮、氮肥来间接起作用。各因素对玉米产量的总决定系数由大到小依次为氮肥>碱解氮>磷肥>速效磷>速效钾。

Path analysis on the relationship between soil fertility and maize production in the North China Plain located in front of Taihang Mountain

The mutual relationship among the main factors influencing maize production was analyzed using the method of path analysis, and the relative significance of each factor to improve maize production was considered. The results showed that nitrogen (N) was the most important factor to influence maize production. N fertilizer and available N in soil had mainly direct effects on maize production, their direct path coefficients being 0.535 and 0.332, respectively. The direct effects of phosphorous (P) fertilizer and available P were very weak, their direct path coefficients being 0.142 and -0.043, respectively. The effect of P fertilizer on improving production was performed through the interaction with N fertilizer, its indirect path coefficient being 0.280, while the effect of available P was mainly performed through available N. The direct effect of available potassium (K) was little and was performed by available N and N fertilizer. The sequence of total decision coefficient of various factors was: N fertilizer >available N > P fertilizer > available P > available K.