有机培肥与轮耕方式对夏玉米田土壤碳氮和产量的影响

孙凯,刘振,胡恒宇,李耕,刘文涛,杨柳,宁堂原,王彦玲

Effect of organic fertilizer and rotational tillage practices on soil carbon and nitrogen and maize yield in wheat-maize cropping system

Kai SUN,Zhen LIU,Heng-Yu HU,Geng LI,Wen-Tao LIU,Liu YANG,Tang-Yuan NING,Yan-Ling WANG

图2 有机培肥和轮耕方式对土壤脲酶活性的影响 同一土壤层次标以不同字母的柱值表示不同处理间差异显著(P<0.05)。**表示在0.01水平上的显著性。T: 耕作因素; C: 有机肥因素; P: 秸秆; F: 牛粪。其他缩写同表1。

Fig. 2 Effects of returning organic manure and rotational tillage practices on urease activity Bars superscripted by different letters are significantly different among different treatments at the same soil layer at P<0.05. * and ** means significance at the 0.01 probability level. T: tillage factor; C: organic fertilizer factor; P: straw; F: cow manure. Other abbreviations are the same as those given in Table 1.