Analysis of the nitrogen uptake and utilization efficiency and N fertilizer residual effect in the wheat-maize-soybean and wheat-maize-sweet potato relay strip intercropping

Abstract

Abstract: The aim of this paper was to study the mechanisms of interspecific nitrogen facilitation and transfer in the relay strip intercropping systems of “wheat/maize/soybean” and “wheat/maize/sweet potato”. The methods of root barrier and ¹⁵N-isotope dilution were used to investigate the nitrogen transfer, nitrogen uptake and residual effect in the two relay strip intercropping systems. Comparing the no barrier with solid barrier, the results showed that in-season ¹⁵N uptake and ¹⁵N recovery efficiency of wheat increased remarkably, and ¹⁵N% abundance left in soil and total N content reduced obviously. In the “wheat/maize/soybean” system, the in-season ¹⁵N uptake and ¹⁵N recovery efficiency, ¹⁵N% abundance left in soil and total N content of maize with no barrier increased by 25.16%, 25.16%, 13.89% and 10.15%. But in the “wheat/maize/sweet potato” system, the value of above indices reduced by 15.98%, 15.99%, 17.37% and 5.19%. For soybean, the in-season ¹⁵N uptake and ¹⁵N recovery efficiency, ¹⁵N% abundance left in soil reduced, the soil total N content increased by 3.03%. For sweet potato, the in-season ¹⁵N uptake and ¹⁵N recovery efficiency increased, ¹⁵N% abundance left in soil and total N content reduced by 0.91% and 4.95%. In the “wheat/maize/soybean” system, the ¹⁵N uptake and ¹⁵N recovery efficiency of wheat and maize obtained from previous wheat, maize and soybean were higher than that of the “wheat/maize/sweet potato” system. The ¹⁵N uptake and ¹⁵N recovery efficiency of soybean obtained from previous wheat or maize were lower than that of sweet potato, but that from previous soybean was higher than that from previous sweet potato. The “wheat/maize/soybean” system was more beneficial to increase annual nitrogen uptake, nitrogen residual effect and maintaining soil fertility.

CLC Number:

YONG Tai-wen, XIANG Da-bing, ZHANG Jing, WAN Yan, LIU Wei-guo, YANG Wen-yu. Analysis of the nitrogen uptake and utilization efficiency and N fertilizer residual effect in the wheat-maize-soybean and wheat-maize-sweet potato relay strip intercropping[J]. Acta Prataculturae Sinica, 2011, 20(6): 34-44.

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