| Effects of sowing date on light use efficiency and biological yield of different varieties of silage maize in Ningxia Yinhuang Irrigation Area |
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| DOI：10.7606/j.issn.1000-7601.2024.05.10 |
| Key Words: silage maize sowing date light use efficiency biological yield Ningxia Yinhuang Irrigation Area |
| Author Name | Affiliation | | LUO Haiqiang | College of Agronomy，Northwest A＆F University, Key Laboratory of Crop Physiology, Ecology and Farming in Northwest Loess Plateau, Ministry of Agriculture and Rural Affairs, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China | | LI Heng | College of Agronomy，Northwest A＆F University, Key Laboratory of Crop Physiology, Ecology and Farming in Northwest Loess Plateau, Ministry of Agriculture and Rural Affairs, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China | | ZHANG Nanhai | College of Agronomy，Northwest A＆F University, Key Laboratory of Crop Physiology, Ecology and Farming in Northwest Loess Plateau, Ministry of Agriculture and Rural Affairs, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China | | HE Jinshang | Crop Research Institute, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan, Ningxia 750199, China | | JIA Zhikuan | College of Agronomy，Northwest A＆F University, Key Laboratory of Crop Physiology, Ecology and Farming in Northwest Loess Plateau, Ministry of Agriculture and Rural Affairs, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China | | ZHANG Weijun | Crop Research Institute, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan, Ningxia 750199, China | | ZHANG Peng | College of Agronomy，Northwest A＆F University, Key Laboratory of Crop Physiology, Ecology and Farming in Northwest Loess Plateau, Ministry of Agriculture and Rural Affairs, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To investigate the effects of sowing date on light use efficiency and biological yield of different silage maize varieties following wheat harvest in the Ningxia Yinhuang Irrigation Area, a split\|plot experimental design was employed. Two silage maize varieties, the early\|maturing ‘Kewo 028’ (Z) and the medium\|late\|maturing ‘Lihe 629’ (W), were selected as the main plots. Three sowing date of 3 days（S1，June 28th），6 days（S2，July 1st）, and 9 days（S3，July 4th）after the wheat harvest were set as the sub\|zones, resulting in a total of six treatments. The effects of different sowing dates on light use efficiency, dry matter accumulation and biological yield of different varieties of silage maize were investigated and fitted to infer the optimum sowing and harvesting periods of different varieties of silage maize. The results showed that the treatment Z had higher leaf area index（LAI）, light use efficiency（LUE）, development degree of photosynthetic production potential （r）, dry matter accumulation （DM） and biological yield (BY) than W. The order of LAI in the whole growth period was ZS1>ZS2>ZS3. At the later stage of growth（after wheat harvest 95 d）, the bottom light transmittal（BLT）and LUE of ZS3 were significantly increased by 13.81%, 5.40% and 15.02% ,23.49%（P<0.05）compared with ZS1 and ZS2, respectively. After wheat harvest 107 d, the BY of ZS1 and ZS2 were significantly decreased by 22.47% and 17.37%（P<0.05） compared to 100 d after wheat harvest, respectively. The treatments were harvested at their optimum harvesting dates and the order of yield size was ZS1>ZS2>ZS3>WS2>WS1>WS3. Correlation analysis showed that the LUE of both varieties was highly significant（P<0.001）positively correlated with its BY and highly significant（P<0.001）negatively correlated with r. Principal component analysis revealed that ZS2 treatment had the best overall evaluation. In summary, it is recommended that early\|maturing varieties in Ningxia Yinhuang Irrigation Area should be harvested after 85 days of growth (sowing 6 to 8 days after wheat harvest), while mid\|late maturing varieties should be harvested after 86 days of growth (sowing 5 to 6 days after wheat harvest). |
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