施肥和密度对春小麦产量根系及水分利用的影响

Output Roots Growth and Water Use of Spring-wheat as Affected by Fertilization and Density of Plant

春小麦是宁夏半干旱区的主要粮食作物，增施肥料和合理密植是提高春小麦产量的主要因素。该项研究是为了探索合理施肥量和种植密度，试验结果表明：合理密植和施肥可有效地达到2250kg／hm产量水平，需施N90kg／hm，P2O5135kg／hm，密度500粒／m；合理施肥可改善作物性状；施肥对根系的影响主要以耕层0～20cm最大；施肥与水分利用效率是正相关，r为0．894**，而密度与水分利用是显著负相关，r为-0．326．

To increase fertilization and density were mainly factors to raise spring-wheat output.This research aimed at studying on the fertilization amount and density rationaly. The resultsrevealed as follows: the rational fertilization and density might increase the crops outputeffectively, and fertilization presented the POsitive relationship,with output with correlationcoefficient of 0. 999 ;the rational fertilization amount and density might improve property; theroots amount as affected by fertilization mainly distribute in 0~20cm layer of soil. Thefertilization presented the positive relationship with water use efficiency with correlationcoefficient of 0. 894** , on the contrary, density presented the negative relationship withcorrelation coefficient of -0. 326.