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本试验的目的在于观察灌溉方法和施以聚丙烯酰胺对土壤物理性质的影响。聚丙烯酰胺(PAM)在休闲的粘壤土上的施用量为650公斤/公顷,PAM处理的小区以每周5cm的用量淹灌未处理的小区采用淹灌或喷灌。所测定的土壤物理性质有:容重、穿透阻力团聚体的稳定性和渗透速率,喷灌和PAM处理的淹灌小区的表土容重比淹灌的对照小区低得多。淹灌对照的表土产生结皮,因而穿透阻力比PAM处理或喷灌处理的地高10倍。施用PAM可使土壤团聚体的稳定性得到改善,从提高17%高到大约80%。处理后的团聚体稳定性(约50%)在整个试验过程中保持不变。PAM处理和喷灌处理的土壤渗透速率大约是对照的两倍。
The purpose of this experiment was to observe the effects of irrigation methods and polyacrylamide on soil physical properties. Polyacrylamide (PAM) was applied on recreational clay loam at a rate of 650 kg / ha. PAM-treated plots were submerged at a rate of 5 cm per week. Untreated plots were flooded or sprinkled. Soil physical properties were determined as follows: bulk density, penetration resistance stability and penetration rate of aggregates, flooding irrigation and PAM-treated submerged plot of surface area bulk density is much lower than the submerged control plot. Submerged irrigation control topsoil produced crust, and therefore penetration resistance than the PAM treatment or sprinkler treatment of the ground 10 times higher. The application of PAM improved soil aggregate stability from as high as 17% to as high as about 80%. Aggregate stability after treatment (about 50%) remained unchanged throughout the experiment. Soil infiltration rates for PAM treatment and sprinkler treatment were approximately double those of the control.