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我县的粮食作物中以小麦为主,约占粮田面积的70%以上,要使小麦产量达到“上纲”、“过河”、“跨江”的要求,究竟用多少水?这对争取小麦丰产有着重大的意义。为了摸清需水规律,我们连续作了五年的试验研究。历年的试验表明:小麦生育期灌四至五次水,在中等肥力条件下用水量240—270立方/亩,就可满足“上纲”、“过河”的要求;在肥力较好的条件下用水量400—500立方/亩,大田生产每亩可以取得800斤的产量。关键是必须按照作物需水规律实行科学灌水,才能达到省水增产的目的。一、作物产量与耗水量的关系农作物通过根系吸收土壤中的水分和养分。通过水对肥、气、热状况的调节形成作物所需要的养分。如果土壤缺水,农作物就受旱减产;如果灌水过多,超过作物需水量的要求,也会导致减产。据试验观测:春小麦生育期亩耗水量在300—400立米之间,具体情况见
The main grain crops in our county are wheat, accounting for more than 70% of the total area of the grain crop, so that the output of wheat will reach the requirement of “crossing the river”, “crossing the river” and “crossing the river” How much water? This is of great significance for the wheat yield. In order to find out the law of water demand, we made five consecutive years of experimental research. Over the years of experiments show that: wheat growth period of four to five times the water irrigation, water consumption in the medium fertility conditions 240-270 cubic meters / acre, can meet the “” “Gang”, “crossing the river” requirements; Under good conditions, water consumption 400-500 cubic meters / acre, field production of 800 pounds per acre can be achieved. The key is to carry out scientific irrigation according to the law of crop water demand in order to achieve the purpose of saving water and increasing production. First, the relationship between crop yield and water consumption Crops through the roots to absorb soil moisture and nutrients. Through the water on the fertilizer, gas and heat conditions to regulate the formation of crops needed nutrients. If there is a water shortage in the soil, crops will be drought-reduced; if it is too much, exceeding the demand for crop water will result in a reduction in production. According to experimental observation: the annual water consumption of spring wheat in the range of 300-400 cubic meters, see the specific situation