Effects of polyacrylamide on soil erosion and soil nutrient loss in sloped apple orchards.

doi:10.13287/j.1001-9332.201609.021

Abstract

Abstract: In order to improve the soil environment, reduce soil erosion and soil nutrient loss, and explore the suitable dry broadcasting rate of polyacrylamide (PAM) in sloped apple orchard, experiments of different dry broadcasting rates of polyacrylamide were carried out in apple orchards with a slope of 20° in the hilly-gully region of northern Shaanxi from 2010 to 2012. PAM treatment levels included 0, 0.6, 0.8, 1.0, 1.2, 1.4 and 1.6 g·m^-2. Surface runoff, eroded sediment, soil nutrient loss, and the growth of apple trees were monitored. Results showed that the surface runoff and runoff yield times from May to July exhibited a “V” shape with the increase of PAM application rate, and reached a minimum at the 1.0 g·m^-2 level. However, the sediment yield decreased with increasing the PAM application rate. The concentrations of the ammonium nitrogen, available phosphorus, and available potassium in surface runoff and sediment decreased with increa-sing the PAM application rate. PAM significantly reduced the content of nitrate nitrogen in surface runoff, whereas it had no significant effect on nitrate nitrogen in sediment. Organic matter, total nitrogen, total phosphorus, and total potassium in the sediment decreased with increasing the PAM application rate. Moreover, PAM improved average fruit mass and fruit yields in sloped orchards, but it had no significant effect on the growth of apple trees and apple fruit flavor. An application le-vel of PAM at 1.0 g·m^-2 should be suitable in sloped apple orchards.

LI Jing-jing, ZOU Chao-yu, BAI Gang-shuan. Effects of polyacrylamide on soil erosion and soil nutrient loss in sloped apple orchards.[J]. Chinese Journal of Applied Ecology, 2016, 27(9): 2991-2999.

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