Research On Effect Of Reducing Nitrogen On Yield And Nitrogen Efficiency Of Different Varieties Of Maize

As an important nitrogen supplement crops, nitrogen plays an important role to improve themaize production. For the pursuit of maize yield in recent years, farmers have made investmentof nitrogen bigger and bigger, however, high nitrogen application rate has caused seriousenvironmental problems. In view of the current low utilization efficiency of nitrogen fertilizerbut using excessively, through the field experiment, this article has nine varieties of maize yieldin the200kg/hm2based on conventional nitrogen, reduce to120kg/hm2nitrogen level in Lishu,and make a comparative study of the reduction of nitrogen fertilizer effect, the n, offer referenceto improving crop yield, providing the local maize varieties and reducing the cost of agriculture.1. It decreases nitrogen by40%on the basis of conventional nitrogen. There is someextent between9varieties of maize production, and the reduction of the average yields only is7.2%. It makes a cluster analysis of production on nine varieties of maize in conventionalnitrogen and nitrogen reduction, and classifies for significant difference high, middle and lowyield. Under the two nitrogen levels, Liaodan570, Zhengdan958, Dika516and Liangyu99arecharacterized by high yield; Jidan27and Suihe369are characterized by middle yield; Nanbei4ischaracterized by low yield.2. Under normal nitrogen level, Liangyu99shows higher plants in different growth periodof nitrogen rate; in the reduction of nitrogen level, the Liangyu99, Dika516and Zhengdan958ineach growth period show higher plant nitrogen rate; under the two nitrogen levels, Nanbei4different growth period shows lower plant nitrogen rates. The average grain nitrogen rate ofreduction of nitrogen was6.78%lower than conventional nitrogen. There is no significantdifference between varieties.3. Nitrogen reduction compared with conventional nitrogen, nitrogen partial productivityby an average of54.79%; nitrogen requirement for an average of100kg of grain per productiondecreased by2.91%; an increase of80kg/hm2nitrogen production rate to an average of7.39kg/kg, Jingke968, Zhengdan958and Jidan27’s production rate is higher. They’re nitrogenneeding breeds, need more nitrogen to achieve high yield (Increasing nitrogen applicationmaize yield in120kg/hm2nitrogen application rate on the basis of an increase of80kg/hm2nitrogen, every increase of1kg/hm2nitrogen efficiency of grain production).4. For a comprehensive analysis, under the condition of conventional nitrogen, Jingke968and Jidna27are varieties of high yield with high efficiency of nitrogen; under the condition ofreducing nitrogen, Dika516, Xianyu335, Liaodan570, Zhengdan958and Liangyu99are high yield with high nitrogen efficiency; Nanbei4is low yield low nitrogen efficiency varieties undertwo nitrogen levels; other varieties’yield and nitrogen efficiency are at medium level.This study only for a year a little test data are analyzed, the conclusion may have somelimitations, in the future should be for many years, more experimental research, its universal lawstill need long-term test to verify to ensure the accuracy of the conclusion.