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为探讨保水剂和黄腐酸在土壤水分保持以及作物耗水的影响效果,2011年在中国农业大学温室进行了玉米盆栽试验,研究两种土壤水分条件下施用保水剂和黄腐酸对玉米的生长、耗水量和水分利用效率的影响。试验设置了2个土壤含水量水平(田间持水量为40%~50%的干旱条件和田间持水量为70%~80%的正常水分条件)、2个保水剂含量水平(分别为0和0.9g/pot)和4个黄腐酸含量水平(分别为0,0.6,1.2和1.8g/pot)。试验用土来自内蒙玉米田间土壤,每个处理重复4次。结果表明:土壤水分状况严重影响玉米的株高、叶面积、穗粒数、干重、产量和收获指数,而保水剂和黄腐酸的施用可以缓解干旱对这些指标引起的不良影响;保水剂的单独施用降低了玉米的蒸腾速率,提高了产量,联合施用黄腐酸后效果更显著。研究结果显示在干旱缺水条件下,折算施用45kg/hm~2保水剂的基础上再施用120kg/hm~2的黄腐酸效果最好,水分利用效率约提高了90%,产量增加了50%。
In order to investigate the effect of water retaining agent and fulvic acid in soil moisture conservation and crop water consumption, a pot experiment was conducted in greenhouse of China Agricultural University in 2011 to study the effect of applying water retaining agent and fulvic acid on maize Growth, water consumption and water use efficiency. Two soil moisture levels (40% -50% of the field water conditions and 70% -80% of the normal water conditions) were set up in the experiment. The content of two water retention agents (0 and 0.9 g / pot) and 4 fulvic acid levels (0, 0.6, 1.2 and 1.8 g / pot, respectively). The test soil was from Inner Mongolia corn field soil, and each treatment was repeated 4 times. The results showed that the soil water status seriously affected the plant height, leaf area, grains per spike, dry weight, yield and harvest index of maize. However, the application of SAP and fulvic acid could alleviate the adverse effects of drought on these indexes. Alone reduced the transpiration rate of maize and increased the yield, and the effect was more significant when combined with fulvic acid. The results showed that under the conditions of drought and water deficit, the optimal application of fulvic acid at 120kg / hm ~ 2 was the best, the water use efficiency increased about 90% and the yield increased by 50% %.