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

This paper is available in a repository.
This paper is available in a repository.

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Abstract

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 N 240 K 180 reached 7 686 kg·hm -2 , which was significantly increased by 7.24% comparing with that under N 180 K 90 , and there was no significant differences between the yields under N 240 K 180 and N 360 K 180 ; (2)Compared with the contents of N and K in wheat under N 180 K 90 , those under N 240 K 180 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 K 2 O fertilizer were 240 kg·hm -2 和180 kg·hm -2 in Huaibei lime concretion black soil area.