SAP、PAM复配对干旱沙化牧区紫花苜蓿生长影响的研究

The Preliminary Study on the Effect of SAP and PAM on the Growth of Alfalfa in Arid and Desert Pasturing Area

干旱沙化牧区土壤保水、保肥性差,不利于紫花苜蓿生长,而SAP、PAM等化学调控材料具有良好的保水、保肥特性,并能够改善土壤结构。因此,通过开展SAP、PAM不同施用量、不同施用方式对干旱沙化牧区紫花苜蓿生长影响的试验研究,以寻求促进紫花苜蓿生长、增产的最佳方案。结果表明:SAP、PAM复配提高了0~20 cm土层体积含水率,为紫花苜蓿提供了良好的水分环境,促进了紫花苜蓿的生长,产量和水分利用效率最大分别提高19.93%和35.67%。在不考虑投入成本等因素前提下,45 kg/hm^2的SAP复配30 kg/hm^2的PAM对于促进紫花苜蓿增产和提高水分利用效率效果最佳。

The poor water retention and fertilizer holding ability of soil in the arid and desertification pasturing area is unfavorable for the growth of alfalfa. Chemical control materials,such as SAP and PAM,have good water retention and fertility conservation ability and can improve the soil structure. Therefore,through the study on the effects of different application rates of SAP,PAM and different application methods on the alfalfa growth in arid and pastoral area,the best plan is put forward to promote the growth and yield of alfalfa. The results show that the combination of SAP and PAM increases the volumetric water content of 0 ~ 20 cm soil layer,provides a good water environment for alfalfa and promotes the growth of alfalfa. The yield and water use efficiency is increased by 19. 93% and 35. 67%,respectively.Regardless of input costs and other factors,the treatment of 45 kg/hm^2 of SAP combined with 30 kg/hm^2 of PAM has the best effect for promoting alfalfa yield and improving water use efficiency.