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我县地处关中,地形复杂。全县有山地、丘陵、台原及平原。总面积1254平方公里,耕地127万亩。主产粮棉,粮食面积90万亩,棉花30多万亩。解放后,灌溉条件不断改善,土壤培肥成为一个突出的问题。施肥水平和问题我县土壤养分供需的状况在不同地区、年份、大体表现为两种情况:1.大部分地区供需基本相等。1980年在全县施纯氮2518.7万斤,磷659.5万斤,按作物实产算,消耗氮1876.4万斤,磷475.8万斤,按理论值计算,每亩余纯氮6.77斤,磷1.09斤,但施入土壤的氮磷和作物吸收的氮磷相抵后,剩余甚少,土壤中氮磷营养元素,基本处于低水平的平衡状态,
My county is located in Guanzhong, terrain complex. The county has mountains, hills, Taiwan and the plains. The total area of 1254 square kilometers, 1270000 acres of arable land. The main grain-producing cotton, grain area 900000 mus, more than 300000 acres of cotton. After liberation, irrigation conditions continue to improve soil fertility has become a prominent issue. Fertilizer levels and problems in our county soil nutrient supply and demand in different regions, years, generally manifested in two situations: 1. Most parts of the supply and demand are basically the same. In 1980, 2518.7 kg of pure nitrogen and 659.5 kg of phosphorus were applied in the whole county, accounting for 18.764 million kg of nitrogen and 4.758 million kg of nitrogen. According to the theoretical calculation, 6.77 kg of pure nitrogen per acre and 1.09 kg of phosphorus , But the nitrogen and phosphorus applied to the soil and the crop absorbed nitrogen and phosphorus offset, the remaining little, the nitrogen and phosphorus nutrients in the soil, the basic state at a low level of equilibrium,