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| DOI：10.13522/j.cnki.ggps.2019173 |
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| The Effects of Trace Irrigation on the Yield and Diurnal Changes of Photosynthesis during Flowering and Boll Stage of Cotton |
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CHEN Liyu1.2, ZHANG Lifeng1*, LU Zhanyuan1.2, XIAN Feng2, ZHANG Jianzhong2, ZHANG Xiangqian2
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1. College of Agronomy, Hebei Agricultural University, Baoding 071000, China;2. Inner Mongolia Academy of Agricultural and Animal Husbandry Science, Hohhot 010031, China
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| Abstract: |
| 【Objective】We aimed to determine the applicability of trace irrigation method in cotton field in arid area.【Method】With the variety of China Cotton Institute 92, the effects of trace irrigation with different tube buried depth of 30 cm (D30), 40 cm(D40), 50 cm (D50) and sub-membrane drip irrigation (CK) on the yield and diurnal variation of photosynthesis during the flowering and boll stage of cotton were systematically analyzed. 【Result】①The diurnal variation of net photosynthetic rate and stomatal conductance presented a bimodal curve with different treatments, and the net photosynthetic rate and stomatal conductance of D30 treatment were higher than other treatments. ②The diurnal variation of intercellular CO2 concentration under different treatments showed a trend of “Beikou V-shaped” bimodal curve. The daily variation of transpiration rate showed a single-peak curve, and the maximum appeared at 14:00 h. ③The two-year average seed cotton yield and average lint yield with D30 treatment were the highest, which were 5 734.28 and 2 545.53 kg/hm2, respectively. The seed cotton yield was 1.09%, 7.63% and 11.38% higher than CK, D40 and D50 treatments, respectively, and the lint yield was 3.49%, 8.32% and 1.61% higher than CK, D40 and D50 treatments, respectively.【Conclusion】According to the diurnal variation of daily photosynthetic characteristics and cotton yield effects, it is concluded that the trace irrigation technique with the tube buried depth of 30 cm is optimal in the cotton field in Alashan area, Inner Mongolia. |
| Key words: irrigation; cotton; flowering and boll stage; diurnal variation of photosynthetic; yield |
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