Impacts of Drip Irrigation Amount on Physiological Characteristics of Summer Soybean and Filed Micro-climate

doi:10.3969/j.issn.1000-6362. 2015.05.008

Abstract

Abstract: The impacts of different drip irrigation amount on physiological characteristics of summer soybean and its filed micro-climate were studied from July to October in 2013, with radomized block design method. Four treatments were conducted in this field experiment, which were named as W1 (3000m3·ha1), W2 (3600m3·ha1), W3 (4200m3·ha1), W4 (4800m3·ha1), respectively. The results showed that the different levers of transmittance were decreased significantly with the increasing of drip irrigation amount at flowering stage and podding stage, with the minimum value at 20cm from bottom of summer soybean in different treatments. Furthermore, there was a significant negative correlation（R=-0.98, P＜0.01）between plant height and population transmittance. The relative humidity inside canopy at 40cm height increased while canopy temperature decreased with the irrigation amount increasing, and the tend of the daily variation of temperature and humidity was conversely. The net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and stomatal limitation (Ls) increased shortly and then decreased with the irrigation amount increasing at flowering stage and podding stage. The treatment W3 had the highest yield of 3741.23kg·ha1, which was higher 30.42%, 13.98% and 8.44% than treatment W1, W2 and W4 with a significant difference in level P<0.05. The irrigation water use efficiency decreased with the irrigation amount increasing. There was no significant difference between treatment W1, W2 and W3, but W3 was the best choice forsummer soybean in local natural condition, with the better population ecological environment, high photosynthetic efficiency, and high yield.

Key words: Drip irrigation amount, Summer soybean, Photosynthetic characteristics, Filed micro-climate, Water use efficiency

ZHANG Yong-qiang, ZHANG Na, LI Ya-jie, SU Li-li, XU Wen-xiu, PENG Jiang-long, HU Chun-hui. Impacts of Drip Irrigation Amount on Physiological Characteristics of Summer Soybean and Filed Micro-climate[J]. Chinese Journal of Agrometeorology, 2015, 36(05): 586-593.

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