| Cite this article: | 师晶晶,兰慧青,张向前,等.滴灌量对耐密宜机收玉米干物质积累分配规律及产量形成的影响[J].灌溉排水学报,0,():-. |
| SHI Jingjing,LAN Huiqing,ZHANG Xiangqian,et al.滴灌量对耐密宜机收玉米干物质积累分配规律及产量形成的影响[J].灌溉排水学报,0,():-. |
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| The Influence of Drip Irrigation on the Dry Matter Accumulation and Distribution Rule and Yield Formation of Maize with High Density and Suitable for Machine Harvesting Maize |
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SHI Jingjing1, LAN Huiqing1, ZHANG Xiangqian2, LU Zhanyuan2, BU Hengtong1, BAI Dongxing1, CHENG Yuchen2, DU Xiangyu3, WANG Manxiu1, CHEN Xuanyi1
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1.Inner Mongolia University;2.Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences;3.Inner Mongolia Mengcao Ecology and Environment (Group) Company Limited
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| Abstract: |
| Abstract:【Objective】To explore the effects of different drip irrigation rates on the dry matter accumulation and distribution rules and yield formation of the grain machine harvest maize under the condition of high dense planting, and to provide scientific basis for further optimizing the water-saving irrigation system of maize in arid and semi-arid areas along the Yellow River basin in northwest China.【Methods】Based on the long-term positioned drip irrigation experiment in the experimental field of the Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences since 2018, six treatments including W1 (415 m3/hm2), W2 (645 m3/hm2), W3 (945 m3/hm2), W4 (1 275 m3/hm2), W5 (1 605 m3/hm2) and natural rain fed (CK) were set up to quantitatively analyze the accumulation and distribution of dry matter above ground of machine harvested maize in 2020 and 2021. Logistic model was constructed to fit the dynamics of dry matter accumulation in maize. And the dry matter accumulation and distribution rules, yield relationship and difference under different drip irrigation levels were explored.【Results】Irrigation could significantly increase the dry matter accumulation in the upper part of maize per plant. The dry matter accumulation process of maize under different treatments conformed to the Logistic model, and the fitting degree R2 was above 0.888 0. The maximum growth rate of dry matter accumulation amount in two years showed an increasing trend with the increase of irrigation water, the CK was the lowest, and the W5 treatment was the highest. The biological yield of W5 treatment was the highest in two years, and the harvest index of W4 and W3 treatment was the highest, 0.51 and 0.50, respectively. Compared with CK, irrigation treatment reduced the dry matter distribution proportion in vegetative organs at maturity, but increased the dry matter distribution proportion in grains. With the increase of irrigation water, the economic yield in 2020 will first increase and then decrease, reaching the maximum value in W4 treatment, 14 282.42 kg/hm2; in 2021, it increased with the increase of irrigation water, W4 (15 480.33 kg/hm2) treatment and W5 (15 892.52 kg/hm2) treatment are significantly higher than the other treatments.【Conclusion】The appropriate amount of irrigation can significantly increase the accumulation rate of the dry matter amount and the dry matter accumulation amount of aboveground part, and promote the distribution of dry matter to the grain of grain machine harvest maize. The drought year type with annual natural precipitation of 364.2～390.7 mm, under the planting density of 7.5 ×104 plants/hm2, the optimum drip irrigation amount is 1 275 m3/hm2 every year in the arid and semi-arid areas of the central and western regions of Inner Mongolia. |
| Key words: Drip irrigation volume, grain machine harvest maize, Logistic equation, dry matter allocation and transport, corn yield |
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