Investigation And Analysis Of Soil Nutrients In Ningxia Lingwu Long Jujube Planting Base

Selected the five sample sites in Lingwu Long Jujube Cultivation Base to test and analyze soil nutrient condition. The results showed that:(1) The fertilizing frequency in Lingwu Long Jujube Cultivation Base was generally six times and mainly by hands or machinery using soil application and leaf spraying application ways. The types of fertilizers used by local farmers are:urea, diammonium phosphate, compound fertilizer, monopotassium phosphate, organic fertilizer etc.(2) The average organic matter content of the soil in Lingwu Long Jujube Cultivation Base wasl4.13g/kg. The average content of total nitrogen and available nitrogen were0.33g/kg and11.53g/kg respectively, but the content of total phosphorus was between0.19g/kg～2.06g/kg, and the rapid available phosphorus was between4.70mg/kg～161.34mg/kg, while the rapid available potassium is319.9mg/kg. The PH value was between7.41～8.97, and the average total salt content was0.79g/kg. The soils from the five samples sites showed quite different organic matter content values, but the contents of nitrogen, appropriate phosphorus, plenty potassium for all samples were very lower which was a lack level. the soil fertility of Hongliuwan Village jujube and Guoyuan Village jujube were relatively high while that of Yinhu Company jujube was relatively poor.(3) The average total nitrogen content, the average total phosphorus content, and the avetage total potassium content of Lingwu Long Jujube leaves were0.102%,0.178%and6.1%respectively. The content of leaf total nitrogen and total potassium in the sample bases were quite different. Leaf analysis showed that the content of nitrogen was very lower while the content of phosphrouswas moderate and the content of potassium was excessive.(4) According to the status of soil nutrients and yield of jujube base, nutrient ratios were recommended for the base that was N:P=1.69:1. Nitrogen fertilizer after long jujube cultivation process shoub be applied much, and the amount of phosphate fertilizer, potash fertilizer shoud be applied less or not.