Consecutive crop residue incorporation hold cotton yield without chemical potassium fertilizer
作者单位：Key Laboratory of Crop Physiology & EcologyMinistry of AgricultureNanjing Agricultural University Institute of Industrial CropsJiangsu Academy of Agricultural Sciences
会议名称：《中国作物学会——2015年学术年会》
会议日期：2015年
关 键 词：Cotton Crop residue incorporation Seedcotton yield
摘 要：Crop residue incorporation increases soil potassium(K)content,but the different effects of crop residue and chemical K on cotton seedcotton yield are poorly *** to identify that is important for cotton potash *** situ field experiments were conducted at Nanjing and Dafeng(*** with available K of 155 and 316 mg kg,respectively),*** rates of wheat straw in cotton season were 0,4500,9000 kg ha(W0,W4500,W9000),and cotton stalk in wheat season were 0,3750,7500 kg ha(C0,C3750,C7500).There were nine combinations of crop residue treatments without chemical K fertilizer in the wheat-cotton rotation ***,three chemical K fertilizer treatments without crop residue were 0,150,300 kg KO ha(K0,K150,K300)in cotton *** research measured cotton seedcotton *** crop residue incorporation hold seedcotton yield in *** replace chemical K retained 2 years at low soil K site,while 3 years at high *** effect of wheat straw on seedcotton yield was bigger than that of cotton *** with W9000could mostly reached the high seedcotton yield level of K150 in this study,while treatments with W4500appeared not enough for the K demand of cotton at Nanjing in 2013.K150 and K300 were not significantly different in cotton ***,consecutive crop residue incorporation holds the seedcotton yield of BT cotton,*** could replace K fertilizer totally or partly in wheat-cotton rotation system in short-term(2-3 years).