Reducing Fertilization at the Blooming Stage Can Alleviate Nitrogen Loss with Surface Runoff in Cotton Field
ZHANG Luping
ZHU Jianqiang
WU Qixia
YAN Jun
Abstract：Field experiment was conducted to investigate the impact of fertilization on nitrogen loss from surface runoff in attempts to improve nutrient management during rainy season in cotton field. Conventional fertilization used by local farmers was taken as the control (CK), and twofertilization treatments, oneusing 80%of CK (T1) and the other using 60%of CK (T2), were examined. The results showed that, compared with the CK, T1 and T2 significantly reduced the average concentration of total nitrogen (TN), NH4+, NO3-, total P, DP and DRP in the sur-face runoff after heavy rainfalls. The decrease in TN and TP was 2.50 and 0.183 mg/L respectively under T1, and 3.41 and 0.234 mg/L respectively under T2. The yield under CK, T1 and T2 was 3500, 3364 and 3242 kg/hm2, respectively. The yield in T1 and CK was comparable, but there was a yield loss in T2. Therefore, reducing fertil-ization at the blooming and the boll-forming stages by 20% (505 kg/hm2) from the conventional fertilization could alleviate nitrogen loss from the surface runoff without scarifying yield.
Keywords：reducing fertilizer applicationcotton fieldsblooming and boll-forming stagessurface runoffnutri-ent loss
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：5( 51-55 )