【摘要】 几种N、P、K复合肥及尿素进行不同配比、不同量和不同施肥方式作追肥试验,结果表明:追肥对造林第1年杨树胸径生长量的影响要大于对高生长的影响,最佳处理的生长量比对照增加1倍以上。不同肥种的作用效果差异表现为尿素>3号肥>2号肥>1号肥。造林第2年杨树的追肥试验结果表明:各种处理对生长量的增幅较大,追肥后生长量的变化幅度比造林第1年要小,肥种对生长量的增幅效果表现为2号肥>1号肥>尿素>3号肥。分次施肥方式的作用效果优于一次性施入方式。施肥效果较好的时间为6月中旬。更多还原

【Abstract】 Several experiments of after manuring with N,P,K compound fertilizers and urea in different ratio,amount,and application patterns were conducted.The results showed that after manuring had greater effects on the increment of dbh than on height increment.The best application pattern could double the increment.The effects of different fertilizer followed the order of urea>fertilizer 3>fertilizer 2>fertilizer 1.The results of after manuring on 2-year-old poplar plantation showed an increased absolute value of increment,the variation of increment after manuring was smaller than that on current planted plantations.The difference among fertilizer followed the order of fertilizer 2>fertilizer 1>urea>fertilizer 3.As for application pattern,separately application was better than that of one-time applying.The experiment showed that middle June was the best time for fertilizing.更多还原