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Response of dry matter accumulation parameters and yield of summer soybean to different amounts of drip irrigation under mulch film.

DU Xiao-jing, FU Xiao-wen, AN Chong-xiao, ZHANG Yong-jie, FANG Yan-fei, XU Wen-xiu*   

  1. (College of Agronomy, Xinjiang Agricultural University, Urumqi 830052, China).
  • Online:2019-06-10 Published:2019-06-10

Abstract: To alleviate the shortage of agricultural water and solve the water contradiction between summer soybeans and spring sowing crops, we examined the effect of different amounts of drip irrigation under film on dry matter accumulation of summer soybean variety Heihe 45. The results from this study would provide theoretical basis for highyield and watersaving cultivation techniques of summer soybean. An experiment with six amounts of drip irrigation under mulch film: 4200 (W0), 3780 (W1), 3360 (W2), 2940 (W3), 2520 (W4), 2100 (W5) m3·hm-2, and one no mulch treatment 4200 m3·hm-2 (CK) were conducted in 2016 and 2017. We measured dry matter accumulation and distribution, dry matter accumulation characteristics, yield and water use efficiency of summer soybean. The results showed that, with increasing irrigation volume, the variation of dry matter accumulation on various organs and per plant were all increased firstly and then decreased, which displayed a pattern of W2>W3>W1>W4>W0>W5≈CK. By fitting the Logistic equation, the dry matter accumulation characteristics of W2 or W3 treatment was better than other treatments in different years, with no significant difference between W2 and W3 treatments. Appropriate amount of drip irrigation could significantly increase dry matter accumulation and average dry matter accumulation rate, shorten the dry matter accumulation time, and accelerate the growth process. The average of the two years’ yields was the highest in W2 treatment, being 3099.49 kg·hm-2, which was 26.14%, 14.27%, 7.23%,7.20%, 20.40% and 34.17% higher than that of CK, W0, W1, W3, W4 and W5. In the case of equivalent growth and yield of soybean, the plastic mulching saved 50% of drip irrigation than no mulching treatment. Therefore, 2940-3360 m3·hm-2 would be the appropriate drip irrigation quota under mulch film for high yield and water saving of summer soybean.

Key words: Camellia oleifera, minirhizotron, fine root, variety.