论文部分内容阅读
研究砾土质戈壁土壤滴灌条件下红枣根系分布情况,为滴灌系统的科学设计和水分精确管理制度的建立及红枣施肥管理提供理论依据。以砾土质戈壁土壤为研究对象,对此类土壤滴灌条件下定植3、5和7a的红枣根系分布采用改良壕沟法进行观察,了解枣树根系的分布和生长情况。结果表明,砾土戈壁滴灌条件下红枣根系有向肥水生长的特性,大量垂直根系主要分布在20～80cm土层,以20～60cm土层较密集,占总根量的65%～80%,水平方向主要分布在0～50cm土层,其根系数量约占全部根系数量的90%以上,其中0～40cm土层根系约占全部根系数量的79%以上。可见,砾土质戈壁滴灌条件下3～7a生的红枣垂直根系主要分布在60cm土层,水平方向主要分布在0～50cm土层,施基肥深度应在30～50cm,施肥槽穴可留在树行中间。
The distribution of root system of Zizyphus jujuba cv. Zizania caduciflora under drip irrigation of gravelly soil was studied to provide theoretical basis for the scientific design of drip irrigation system and the establishment of precise water management system and management of jujube fertilization. Taking gravelly Gobi soil as the research object, the distribution of root system of jujube with 3, 5 and 7a colonization under the conditions of drip irrigation was observed by using improved trenches method to understand the distribution and growth of jujube root system. The results showed that the jujube root system had the characteristics of directed fertilizer and water growth under the condition of drip irrigation in the gravel soil. A large number of vertical roots were mainly distributed in the soil layer of 20-80 cm, the soil layer of 20-60 cm was dense, accounting for 65-80% The horizontal direction is mainly distributed in 0 ~ 50cm soil layer, the root number of which accounts for more than 90% of the total root number, of which 0 ~ 40cm soil layer accounts for more than 79% of the total root number. It can be seen that the vertical root system of the dates of 3 ~ 7a under Gobi drip irrigation is mainly distributed in 60cm soil layer, the horizontal direction is mainly distributed in 0 ~ 50cm soil layer, the depth of base fertilizer should be 30 ~ 50cm, fertilization slot can be left in the tree Middle of the line.