Effect of Soil Texture on the Distribution of Nitrate Nitrogen in the Soil Profile and Its Influence on Drip-irrigated Cotton Production
MA Gexin
ZHANG Ze
WEN Pengfei
ZHANG Dongming
L(U) Xin
Abstract：The methods of column simulation in greenhouse was used to study the effect of soil texture on the distribution of NO3-N in the 0～60 cm soil and cotton yield under drip irrigation.The results showed that when irrigation amounts were the same,N application rates of 256.00 kg/hm2 to sand soil and 287.34 kg/hm2 to loam resulted in the greatest cotton production.Compared with the unfertilized control (CK),these fertilizer amounts increased cotton yield by 43.87％ in the sand soil and by 44.92％ in the loam.Soil NO3-N was mainly distributed in the 30～40 cm depth under these N application rates.This was conducive to the absorption of N by the cotton root system,thus allowing soil N absorption efficiency to be properly regulated and production to be increased.The results also showed that when fertilizer rates were the same,soil NO3-N was distributed more uniformly in the loam soil than in the sandy soil.Soil NO3-N was mainly distributed in the 20～40 cm soil depth of the loam soil.This improved the N utilization rate and increased cotton yield by an average of 6.16％ compared with the sand soil.Soil NO3-N content in both the sand soil and loam soil changed with the curve of "decrease-increase-decrease" across the growing season.At the second peak,soil NO3-N content in the 60 cm depth with N application rate of 340 kg/hm2 was 15.98％ greater in the sand soil than in the loam soil.At the end of the growth period,the sand soil had greater N content than the loam soil and therefore had greater risk for N loss due to leaching.
Keywords：drip irrigationnitrogen applicationnitrate nitrogenyield
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 44-51 )