| Cite this article: | 李建查,方海东.灌水量和种植密度对干热河谷洋葱生物量及养分吸收利用的影响[J].灌溉排水学报,0,():-. |
| lijiancha,Fang haidong.灌水量和种植密度对干热河谷洋葱生物量及养分吸收利用的影响[J].灌溉排水学报,0,():-. |
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| Effects of irrigation amount and planting density on biomass and nutrient absorption and utilization of onion in an arid hot valley |
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lijiancha, Fang haidong
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Institute of Tropical Eco⁃agricultural Sciences，Yunnan Academy of Agricultural Sciences，
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| Abstract: |
| 【Objective】The biomass and nutrient absorption and utilization effects of irrigation amount and planting density were studied, in order to reveal the onion nutrition strategy of water and density management model and the mechanism of water saving, fertilizer reduction, yield increase and efficiency enhancement. 【Method】A field experiment was conducted for onion. Irrigation amount for I1 7000m3?hm-2, I2 4550m3?hm-2, I3 3300m3?hm-2 and planting density for D1 221200 plants?hm-2, D2 118800 plants?hm-2 were setup at the same time. Onion biomass, bolting percentage, nutrient absorption and utilization efficiency, harvest indices and WUE were investigated. 【Result】The results showed that irrigation amount treatments had significant effect on WUE, nutrient absorption and utilization efficiency. Onion P absorption efficiency, K absorption efficiency, Mg absorption efficiency were highest under I1 treatment. Onion P utilization efficiency, K utilization efficiency, Mg utilization efficiency and WUE were highest under I3 treatment. Planting density significantly affected onion biomass, bolting percentage, nutrient absorption and utilization efficiency. Onion N absorption efficiency, P absorption efficiency, Mg absorption efficiency were highest under D1 treatment. Onion N utilization efficiency, P utilization efficiency, Mg utilization efficiency were highest under D2 treatment. Onion had significant individual biomass advantage and lowest bolting percentage under D2 treatment. There were significant interactions between irrigation amount and planting density factors for onion biomass, bolting percentage, WUE, nutrient absorption and utilization efficiency, harvest indices. Onion P absorption efficiency, K absorption efficiency, Ca absorption efficiency, Mg absorption efficiency were significant highest under I1D1 treatment. Onion had significant highest N harvest indices, P harvest indices, K harvest indices, WUE and Mg utilization efficiency I1D1 treatment. I3D2 had the highest comprehensive score in principal component analysis, I1D1 was the second. 【Conclusion】This suggested that the optimal irrigation amount and planting density of Onions are I3D2 and I1D1in an arid hot valley. If water saving, fertilizer reduction, production increase and efficiency enhancement are taken as the premise, to improve water and fertilizer utilization efficiency and reduce the bolting rate, I3D2 is selected. Onion bolting percentage was negatively correlated with K harvest indices. There were significant positive correlation among onion biomass, yield, WUE, and N utilization efficiency and N harvest indices.Onion P absorption and K absorption were positively correlated with Mg absorption efficiency. Onion P utilization efficiency and Ca utilization efficiency were positively correlated with Mg utilization efficiency. Onion N harvest indices and K harvest indices were positively correlated with Mg harvest indices.The research results can provide scientific support and technical reference for onion water-saving and efficient agriculture development in an arid hot valley irrigated area. |
| Key words: irrigation amount; planting density; biomass; nutrient absorption and utilization; an arid hot valley |
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