| Effect of reduced drip irrigation on photosynthetic characteristics and yield of cotton during flowering and bollstagein in Northern Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2021.03.07 |
| Key Words: cotton flowering and boll stage reduced drip irrigation photosynthetic characteristics chlorophyll fluorescence yield |
| Author Name | Affiliation | | DOU Qiaoqiao | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | ZHANG Jusong | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | HE Qingyu | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | DAI Jianmin | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | XIE Ling | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | ZHANG Weitao | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | CHEN Xiuling | Agriculture College, Xinjiang Agricultural University / Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| According to the phenomenon of increasing rainfall at cotton flowering and boll stage in Northern Xinjiang in recent years, in order to clearify whether it is feasible to reduce drip irrigation at flowering and boll stage and its influence on the formation process of cotton yield, with Xinluzao 50 and Xinluzao 73 as materials, we set up an experiment with two reduction drip irrigation during flowering and boll stage (W1: 2 050 m3·hm-2，W2: 1 650 m3·hm-2) and at the same time with the optimal amount of drip irrigation as control (CK: 2 450 m3·hm-2) with dynamic changes of soil water content. The photosynthetic fluorescence characteristics and yield composition of canopy leaves in different soil layers of 0~60 cm after treatment were systematically analyzed. The results showed that with decreasing drip irrigation amount, the reduction range of soil moisture content increased.In the treatment of 33~45 d, stomatal conductance (Gs), intercellular CO2 concentration (Ci) and the net photosynthesis rate (Pn) decreased by 5.40%~35.48%, 1.24%~9.47%, and 9.22%~26.78%, respectively, in the treatment of reduced drip irrigation of the two varieties where Xinluzao 50 decreased greatly among varieties. The different plots of relative chlorophyll a fluorescence (ΔVt) of the two varieties fluctuated greatly at the K point (300 μs), and W2 treatment was higher than W1 treatment. Under W2 treatment,the ΔK of Xinluzao 50 and Xinluzao 73 were 0.025 and 0.0239, respectively, Wk value increased by 54.55% and 35.14% compared with the control, respectively. The Mo, VI, and VJ of two varieties were showed as W2<./sub>> W1> CK, and ψo, φPo,φEo, and PIABS,total all decreased with the reduction of drip irrigation. Among them, Xinluzao 50 decreased more. Under W1 and W2 treatments,the boll number per plant of two varieties decreased by 1.67%~3.17% and 14.29%~15.00%, respectively, and the yield decreased by 6.27%~7.77% and 19.28%~21.75%, respectively, the yield of Xinluzao 50 decreased more. The main reason of reduced drip irrigation treatments for the decrease of Pn of cotton leaves were stomatal limitation factors, but did not cause severe water deficit in cotton field in Northern Xinjiang during flowering and boll stage. Under W1 treatment, the PSⅡ donor\|side oxygen\|evolving complex (OEC) of the leaf photosynthetic apparatus of the two varieties of cotton was not significantly damaged. The yield of was less, which could be used as the reference amount of drip irrigation when water supply was insufficient.Among the varieties, Xinluzao 73 was more suitable for planting when the water supply of cotton fields in Northern Xinjiang was insufficient. |
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