Effects of Reducing Nitrogen Fertilizer and Increasing Humic Acid Liquid Fertilizer on Yield and Nitrogen Use Efficiency of Summer Maize
QIN Wen
HAN Yanlai
ZHANG Yibo
QIAO Dandan
LI Ningning
ZHAO Jiajun
ZOU Xurui
LI Hui
Abstract：In order to minimize the amount of nitrogen fertilizer under the premise of ensuring a higher yield of summer maize,and determine the reasonable proportion of humic acid liquid fertilizer and nitrogen fertilizer,the field experiments were carried out with 6 treatments:no fertilizer(CK),the normal application amount of nitrogen (210 kg/ha,100 ％ N),reducing 20％ application amount of nitrogen fertilizer (168 kg/ha,80％ N),reducing 20％ application amount of nitrogen (168 kg/ha) with humic acid liquid fertilizer 1.7 L/hm2 (80％ N + WF),reducing 40％ nitrogen application amount(126 kg/ha,60％N),reducing 40％ nitrogen application amount(126 kg/ha) with humic acid liquid fertilizer 1.7 L/ha (60％ N + WF),and the effects of reducing nitrogen fertilizer and increasing humic acid liquid fertilizer on yield and nitrogen use efficiency of summer maize were studied.The results showed that compared with 100％ N treatment,there was no significant change in soil organic matter,alkali-hydrolyzable N contents,pH value,nitrogen recovery efficiency and nitrogen fertilizer physiological efficiency;while the agronomic efficiency of nitrogen fertilizer was significantly increased by 9.8％,which eventually caused the result that the grain number per spike,grain weight and yield of summer maize were close to 100％ N treatment.However,further reducing the amount of nitrogen fertilizer and increasing the amount of humic acid liquid fertilizer (60％ N + WF)would reduce soil alkaline nitrogen and organic matter contents with no significant difference,but the descent scope was bigger than that of 80％ N + WF treatment;although the agronomic efficiency of nitrogen fertilizer and the recovery efficiency of nitrogen fertilizer of 60％ N + WF treatment could also improved,the grain number per spike and the yield of summer maize significantly decreased by 2.7％ and 5.2％ compared with 100％ N treatment.In conclusion,80％ N + WF treatment could achieve the effect of 100％ N treatment under the condition of reducing N application by 42 kg/ha,and obtain higher soil fertility,agronomic efficiency and recovery efficiency of nitrogen fertilizer,grain number per spike and yield.
Keywords：humic acid liquid fertilizersummer maizeyieldnitrogen use efficiency
Publication Date：2017-04-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 21-25 )