| Heilongjiang province as the total grain output for ten consecutive years of the first major grain-producing provinces,natural rainfall is an important source of agricultural irrigation water,but influenced by geographical location and climate conditions,the average annual rainfall,uneven distribution of small,lead to crops on rainfall use efficiency is low,can not be fully meet the growing demand for water.Traditional irrigation has become an important agricultural water-saving technology due to its high construction cost and large amount of engineering,convenient application of water-retaining agent and low cost.Water preserved their properties are measured,this study explore the influence of different factors for water preserved repeat water absorption performance,to explore the soil sample water-retaining properties of adding water retention agent,selection of soybean as test crop,applying different doses of soybean,water retention agent,the research of soil moisture content,soybean plant height and stem diameter,the change of the production,get the following conclusion:(1)Temperature has no significant effect on the second repeated water absorption of the water-retaining agent,indicating that freezing and high temperature will not damage the molecular structure of the water-retaining agent.The Super Absorbent Polymers still has a good repeatable water absorption performance without ion interference,and tap water has a greater effect on the repeatable water absorption of Super Absorbent Polymers.When the ratio of water retention agent dosage to soil mass is 0.4%,the soil water level obviously fails to reach the purpose of water saving,which reflects that the excessive amount of water retention agent is not conducive to drought resistance and water saving.Under the condition of complete release of water,the absorbent capacity of Super Absorbent Polymers is reduced under the disturbance of soil environment and salt ions.(2)The initial water absorption rate of water-retaining agent in the soil is greatly affected,and the increase of the dosage of water-retaining agent can compensate for the effect of the soil environment which reduces the water absorption rate of water-retaining agent to a certain extent.After several freeze-thaw cycles of water-retaining agent,the repeated water absorption capacity of soil samples without water-retaining agent is almost not affected.The water absorption capacity of soil samples without water-retaining agent is increased,because the porosity of soil samples increases after frost heaving,leading to the increase of capillary suction of soil samples and the increase of soil water holding capacity.After freezing and thawing cycle,the water absorption of soil samples with Super Absorbent Polymers added will increase,and the water absorption is greater than that of soil samples without Super Absorbent Polymers.This is because the porosity of soil samples increases after frost heave,and the Super Absorbent Polymers has more space to absorb water,which increases the water holding capacity of soil samples.(3)The general trend of surface soil moisture content and deep soil moisture content basically showed that the control group treated with 5>,4>,3>,2>,and 1>.The water-retaining agent can promote the plant height and stem diameter of soybean.At the same time,within a certain dose range,the higher the application dose of water-retaining agent,the more obvious the promotion effect is,which can promote the early growth and rapid growth of soybean seedlings,increase the vegetative body of the plant,and have more photosynthetic organs for photosynthesis.The yield of soybean treated with Super Absorbent Polymers was higher than that of control group without Super Absorbent Polymers.With the increase of application amount of Super Absorbent Polymers,the yield range and yield increase rate were higher.The soybean treated with 90kg/hm~2 of Super Absorbent Polymers had the highest yield,reaching 158.61kg/unit. |
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