| The influence of deficit irrigation during different growth periods on the yield components and harvest index of intercropped crops |
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| DOI：10.7606/j.issn.1000-7601.2016.04.06 |
| Key Words: deficit irrigation intercropping crops yield components water sensitivity index harvest index |
| Author Name | Affiliation | | ZHANG Zuo-wei | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | SHI Hai-bin | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | LI Zhen | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | LI Xian-yue | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | YAN Jian-wen | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | LI Jie-jun | Dengkou Water Affairs Bureau, Dengkou County, Bayannaoer, Inner Mongolia 015000, China |
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| Abstract: |
| In consideration of the drought and water shortage in Inner Mongolia Hetao irrigation district, deficit irrigation experiments which took the spring wheat/maize and spring wheat/sunflower intercropping systems as the research object during different crop growth periods were conducted. The results showed that the effective tiller number was increased by 5.4%～15.07% with 15 mm increase in irrigation at wheat tillering stage, whereas the grains per spike, 1000-grain weight and yield were increased first and then became decreased at the wheat milk stage under the aggravation of the water stress. As for the yield component of maize in the intercropping mode, decreasing the irrigation amount at wheat tillering and jointing stages and increasing the irrigation amount at wheat milk stage and maize grouting silking stage were beneficial to increasing the maize yield substantially in water-deficient district. In addition, with the increase of total irrigation amount, the grains per spike was increased with a rate of 1.27～2.47 grain·mm-1, and the maize yields were increased gradually as 62.24, 94.93 kg·mm-1, and 29.73 kg·mm-1 in a pattern of “S” rate curve. However, the yield component of sunflower in the intercropping mode was mainly influenced by water treatments at wheat milk stage and sunflower budding stage. Furthermore, the grains per sunflower spike were increased at the beginning and then became decreased with the increase of irrigation amount, whereas the 100-seed-weight and sunflower yield were in N-shape and M-shape curves, respectively. Under different irrigation treatments, as for the water sensitivity index of intercropping crops, that of wheat was the highest, that of sunflower was the lowest, and that of maize was in the middle. As for the harvest index of intercropping crops under the aggravation of water stress, that of wheat was increased generally, that of maize was increased with the increase of total irrigation amount, whereas that of sunflower was decreased. |
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