Effects of Combined Application of Nitrogen and Potassiumon on Yield and Nutrient Accumulation of Wheat in Huaibei Lime Concretion Black Soil Area, China

• Main Authors: LEI Zhi-meng, HAN Shang, WU Ji, ZHU Lin, WANG Jian-lai, HE Xian-fang
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2017-03-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: combined application of N and K; wheat; yield; nutrient absorption; fertilizer benefit
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2017/2/20170210.htm
• ISSN: 2095-6819; 2095-6819

To provide theoretical and technical basis for the scientific application of nitrogen (N) and potassium (K) fertilizer in wheat cropping in Huaibei lime concretion black soil area, a field experiment was performed to study the effects of different N and K treatments (N:180, 240, 300, 360 kg·hm^-2;K:90, 135, 180 kg·hm^-2) on wheat yields, absorption of N and K, and fertilizer benefits. The results showed that: (1)The wheat yield under application of N₂₄₀K₁₈₀ reached 7 686 kg·hm^-2, which was significantly increased by 7.24% comparing with that under N₁₈₀K₉₀, and there was no significant differences between the yields under N₂₄₀K₁₈₀ and N₃₆₀K₁₈₀; (2)Compared with the contents of N and K in wheat under N₁₈₀K₉₀, those under N₂₄₀K₁₈₀ were significantly increased by 14.67% and 29.53%, respectively; (3)There was a positive interaction between the application of N and K fertilizer, and the interaction was significantly correlated with wheat yield at a contribution rate of 14.06%, which consequently increased the partial productivities of N and K fertilizer. Considering wheat yield and fertilizer benefit, the optimum application amounts of N and K₂O fertilizer were 240 kg·hm^-2和180 kg·hm^-2 in Huaibei lime concretion black soil area.