Effects of Different Proportions of Substituting Chemical Fertilizer Nitrogen with Decomposed Cow Dung Nitrogen on Rice Yield,Quality and Nitrogen Use Efficiency Under Mulched Drip Irrigation
TANG Wenxue
MA Zhongming
XUE Liang
LIAN Caiyun
WANG Zhiqi
LUO Shuanglong
DUAN Yu
Abstract：This study investigates the optimal substitution levels of organic nitrogen for chemical nitrogen of rice cultivation under mulched drip irrigation,aiming to support high-yielding and high-quality rice cultivation technology in the Hexi Oasis irrigation region.Field trials were conducted in 2022 at the Zhangye Water-Saving Agriculture Experimental Station,Ganzhou District,Zhangye City.The treatments included no-fertilizer control(CK),chemical fertilizer only(0％ON),and organic nitrogen substituting 25％(25％ON),50％(50％ON),75％(75％ON),and 100％(100％ON)of chemical nitrogen.The impact of these treatments on rice yield,grain quality,and nitrogen use efficiency(NUE)was assessed.The results showed that at a nitrogen application rate of 225 kg/hm2,integrating organic nitrogen significantly enhanced both yield and NUE,with a particularly notable improvement in grain quality.The treatment with organic fertilizers increased seedling survival rates by 6.36％to 17.76％compared to chemical fertilizer alone,and yields by 17.30％to 34.21％compared to the unfertilized control.Compared with the single application of chemical fertilizer,the yield of 25％ON and 50％ON treatments was only reduced by 1.45％and 5.74％,and there was no significant difference in nitrogen use efficiency between 25％ON and 25％ON.Organic nitrogen treatments significantly reduced protein content in rice by 0.74％to 5.93％and amylose content by 1.14％to 5.14％,while head rice rate and taste value increased by 1.92％to 4.22％and 0.61％to 1.83％.Furthermore,the rate of chalky grains and degree of chalkiness were significantly reduced in the 25％ON and 50％ON treatments by 5.26％,13.16％,11.76％and 17.65％,respectively.Considering the comprehensive results of yield,NUE,and grain taste,the substitution ratio of 25％to 50％organic nitrogen is identified as the optimal range for achieving high yield and improving quality in rice cultivation in the Hexi Oasis irrigation region.
Keywords：Rice under mulched drip irrigationCombined application of organic fertilization and inorganic nitrogen fertilizerYieldQualityNitrogen use efficiency
Publication Date：2025-06-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 47-56 )