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| DOI：10.13522/j.cnki.ggps.2019111 |
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| Effects of more plants per hole on yield and population quality of spring maize with wide-narrow allocation under drip irrigation |
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LIAN Caiyun, MA Zhongming
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1. Institute of Soil, Fertilizer and Water-saving Agriculture of Gansu Academy of Agricultural Sciences, Lanzhou 730070, China; 2. Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
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| Abstract: |
| 【Objective】The influence of the yield and population quality of spring maize was studied under drip irrigation with certain planting density and row spacing to increase yield of spring maize, water and nitrogen use efficiency and realize the mechanization in the field.【Method】There were three treatments in the field:1 plant per hole (H1,37cm broad-row),2 plants per hole (H2, 104 cm broad-row) and 3 plants per hole (H3, 172 cm broad-row).【Result】The difference of the leaf areas and LAI between treatments was significant after the big bell stage.Compared with H1 and H3,the leaf areas under H2 treatment increased by 13.8% and 7.6%, respectively, and the dry matter accumulation was higher after the silk stage. The photosynthetic potential under H2 treatments increased by 4.60%~12.74% and 8.97%~9.79%, respectively, and the relative growth rate increased by 21.15% and 103.06%, respectively, from silk stage to mature stage. The yield of H2 treatment was significantly higher than that of H1 and H3 by 21.6% and 24.6%, respectively, while WUE increased by 25.0% and 33.5%, respectively.【Conclusion】By double plants per hole of spring maize under drip irrigation, the LAI and photosynthetic potential were enhanced with delaying green leaves. Thus, it is helpful to accumulate dry matter in later stage, increase grain weight and finally increase the yield. Compared with 1 plant per hole (conventionally plant), the yield increased by 21.6% and WUE improved by 25% under double plants per hole. |
| Key words: drip irrigation; more plants per hole; spring maize; yield; population quality |
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