腐殖酸保水剂用量对白浆土养分及玉米产量性状的影响研究

Properties of Corn Yield and Albic Soil Nutrient Affected by the Dosages of Humic Acid Water-retaining Agent

腐殖酸富含亲水基团,以此为核心成分的保水剂施入土壤后会增加土壤蓄水保墒能力,发挥较好的保肥效应。以不施肥（CK）为空白对照,研究不同腐殖酸保水剂用量（33、44、55、66 kg/hm^2）对白浆土养分及玉米产量性状的影响。结果表明,施用33～66 kg/hm^2腐殖酸保水剂可有助于玉米生育性状（玉米出苗率、灌浆期展开叶片数、株高、单叶叶面积、穗粒数）及产量的提高。与不施保水剂相比,施用44～66 kg/hm^2腐殖酸保水剂可有利于白浆土酸化过程的缓解。与拔节期相比,施用55 kg/hm^2保水剂能够使玉米历经生育期仍能确保全氮含量的增加;施用腐殖酸保水剂33 kg/hm^2能使白浆土有机质含量的消耗程度达到最大,在此基础上继续增加保水剂用量可有效缓解有机质含量的消耗。

Humic acid is rich in hydrophilic groups, which can be used as the core component of water-retain-ing agent to enhance the soil water conservation ability and make a good fertilizer effect. In this article, the soil nutri-ent and corn yield were explored based on the different dosages of humic acid water-retaining agent, in the processno fertilization（CK） served as a blank control. The different dosages of humic acid water-retaining agent were set for33, 44, 55 and 66 kg/ha, respectively The results showed that, the corn growth traits（emergence rate, number of un-folded leaf during grain filling, plant height, area of single leaf, kernels per spike） and yield were enhanced by theapplication of humic acid water-retaining agent regardless of their dosages（33-66 kg/ha）. Compared with no water-retaining agent, 44-66 kg/ha humic acid water-retaining agent was more favorable to the reduction of acidificationdegree of Albic soil. Compared with the jointing stage, 55 kg/ha humic acid water-retaining agent could make the to-tal N content accumulated in Albic soil after the harvest of corn. 33 kg/ha humic acid water-retaining agent couldmake the organic matter content consumed furthest, on this basis increasing the dosage of humic acid water-retain-ing agent continuously could effectively alleviate the consumption of organic matter.