摘要
采用盆栽和田间试验方法,研究多功能复混肥对甘肃河西内陆灌区制种玉米田土壤理化性质的影响并确定最佳施肥量。结果表明:随着多功能复混肥施肥量的增加,土壤总孔隙度、团聚体、EC(电导率)、有机质、碱解N、速效P、速效K含量随之增大,而容重和pH在降低。多功能复混肥施肥量与玉米植物学性状、经济性状、产量呈正相关,与单位肥料增产量呈负相关。随着施肥量增加,玉米边际产量、边际利润呈递减趋势,施肥量在1875kg.hm-2的基础上,再增加施肥量,收益出现负值。多功能复混肥与玉米产量间肥料效应回归方程是:y=3043+1.0109x-0.0002088x2,经济效益最佳施肥量(x0)为1875 kg.hm-2,玉米预测产量(y)为5672 kg.hm-2。在风沙土上施用多功能复混肥,有效地改善了土壤的理化性质和生物学性质,提高了制种玉米的施肥利润和产量。
The pot and field experiments were conducted to investigate the effects of multi-functional compound fertilizer for corn seed production on soil physical and chemical properties and to determine its optimal fertilization rate in Hexi irrigation area.The results showed that,with the increase of the multi-functional fertilizer rate,the total soil porosity,aggregate structure,EC（conductivity）,organic matter,alkaline hydrolysis N,available P and available K increased,whereas the bulk density and pH decreased.The rate of multi-functional fertilizer was positively correlated with the botany traits,economic traits and yield of corn,but was negatively correlated with the yield increase per unit fertilizer input.The marginal yield and marginal profit of corn seeds declined with the increase of fertilizer rate.When the fertilizer rate continued to increase on the basis of 1875 kg·hm-2,the benefit became a negative value.The regression equation between yield and multi-functional fertilizer rate was： y=3043.18＋1.0109x-0.0002088x2,and the fertilizer rate with best economic benefit（x0） was 1874.81 kg·hm-2,at which the predicted production of corn was 5672.34 kg·hm-2.It was concluded that,in the sand soil,the multi-functional compound fertilizer could improve effectively the soil physical,chemical and biological properties,and raise the output and profit in corn seed production.
出处
《干旱地区农业研究》
CSCD
北大核心
2013年第2期66-72,共7页
Agricultural Research in the Arid Areas
基金
科技部国家星火项目"甘肃河西走廊百万亩现代化制种及加工装备技术示范推广"(S2011G100031)
甘肃省高等学校2010年研究生导师科研项目(1009B-05)
甘肃省高校河西走廊特色资源利用省级重点实验室项目(XZ1002)
关键词
制种玉米
多功能复混肥
理化性质
最佳施肥量
corn seed production
multi-functional compound fertilizer
physical and chemical property
optimal fertilization rate
