| Effects of irrigation amount on maize yield and water use efficiency under full mulching with ridge seeding and furrow irrigating |
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| DOI：10.7606/j.issn.1000-7601.2017.02.34 |
| Key Words: maize irrigation amount yield water use efficiency |
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| Abstract: |
| Field experiments were employed to find the effects of different irrigation amount on maize yield and water use efficiency under full mulching with ridge seeding and furrow irrigating in Shiyang river basins. It turned out the yield did not increase with the increase of irrigation amount from 4 500 m3·hm-2 to 4 725 m3·hm-2 and 4 950 m3·hm-2. However, without decrease in water use efficiency, when the irrigation amount increased to 5 175 m3·hm-2, the yield increased by 11.46%, 8.39% and 8.54% in the treatments of I180, I195 and I210 respectively. The increase was mainly attributed to the average increase in spike length by 4.88%, grain number by 3.27% and 100-grain mass by 4.31%. The soil water content was significantly higher in I225 treatment in the other three treatments at water demand peak by corn (from 16 July to 3 August), while there was no significant difference in the treatments at filling stage. Compared with the seeding stage, the decreased layers of soil water content were mainly located at 20～80 cm soil layers at harvest, and soil water storage decreased by an average of 6.72 mm. There was no significant differences of the soil water storage among treatments at 0～110 cm soil layers. It was concluded that 5 175 m3·hm-2 was the appropriate irrigation amount for maize under full mulching with ridge seeding and furrow irrigating in Shiyang river basins, but at the late filling stage it was desirable to reduce the irrigation amount appropriately. |
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