Effect of Straw Returning and Fertilization on Yields of Wheat-Rape Multiple Cropping and Resource Use Efficiency

doi:10.11924/j.issn.1000-6850.casb15090043

Abstract

Abstract: In order to reduce fertilizer application, control pollution of straw burning and explore technical ways of straw returning, randomized block design method and field experiment were conducted in Hexi Corridor of Gansu Province. The effect of straw returning methods including standing stubble, crushing and burning, and reduced fertilization on multiple cropping of wheat-rape was studied. The results showed that the highest wheat yield was 7444 kg/hm2, which was obtained by high fertilization and wheat straw returned after crushing. The highest rapeseed yield was 997 kg/hm2, which was obtained by wheat straw burning and 15% fertilizer reduction. Water use efficiency, nitrogen utilization rate and phosphorus utilization rate of wheat were the highest by wheat straw returned after crushing and fertilizer reduction of 15%, and water use efficiency of rape was the highest under wheat straw burning and fertilizer reduction of 15% . Light energy utilization efficiency was the highest by high fertilization and wheat straw returned after crushing. The yield, light energy utilization efficiency, nitrogen utilization rate and phosphorus utilization rate did not differ significantly among different treatments when fertilizer application was reduced by 15% . Therefore, under the reasonable conditions of straw returning, it was feasible to cut the chemical fertilizer application by 15% compared with current high fertilization rate. By comprehensive analysis of economic benefit, ecological benefit and environment protection, it showed that sowing rape after wheat harvest leaving stubble of 25 cm high and straw crushing and returning with rotary cultivator was the best practice.

CLC Number:

S344.3

杨育川,,, and . Effect of Straw Returning and Fertilization on Yields of Wheat-Rape Multiple Cropping and Resource Use Efficiency[J]. Chinese Agricultural Science Bulletin, 2016, 32(9): 20-26.

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