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对在不同浓度的盐胁迫条件下,叶面喷施液态腐植酸和土壤施用腐植酸类物质对小麦作物生长和矿物营养吸收的影响进行了研究。通过添加不同量的NaCl得到不同的盐浓度环境。腐植酸类物质在作物种植前一个月施用,液态腐植酸在种苗发芽后20d和35d喷施于小麦叶面。腐植酸类物质的施用量为0、1g/kg、2g/kg,液态腐植酸的浓度为0、0.1%、0.2%。盐度对小麦生长具有负面影响,它会降低小麦对除Na、Mn以外的矿物营养的吸收,影响小麦干重。通过在土壤施用腐植酸类物质可以增加小麦对N的吸收,叶面施用腐植酸可增加其对P、K、Mg、Na、Cu和Zn的吸收。研究结果显示:在土壤中施用腐植酸类物质,不同盐浓度与施用量之间存在较好的相关性,但叶面喷施时盐度和喷施量之间相关性并不明显。在盐胁迫环境的影响下,叶面喷施腐植酸的初始浓度和土壤中施用的腐植酸类物质的初施量都增加了作物对营养元素的吸收。
The effects of foliar application of humic acid and soil humic acids on crop growth and mineral nutrient uptake were studied under different salt concentrations. Different salt concentrations were obtained by adding different amounts of NaCl. Humic acids were applied one month prior to crop planting. Liquid humic acid was sprayed on the wheat foliage 20 d and 35 d after germination. The amount of humic substances applied was 0, 1 g / kg, 2 g / kg, and the concentration of liquid humic acid was 0, 0.1%, 0.2%. Salinity has a negative effect on the growth of wheat, which reduces the absorption of mineral nutrients other than Na and Mn by wheat and affects the dry weight of wheat. Foliar application of humic acid increased its uptake of P, K, Mg, Na, Cu and Zn by increasing the uptake of N by soil application of humic acids. The results showed that there was a good correlation between different salt concentration and application rate of humic substances in soil, but the correlation between salinity and spraying rate was not obvious when foliar application. Under the salt stress environment, the initial concentration of humic acid foliar spraying and the initial application amount of humic acid in soil all increased the nutrient absorption of crops.