宁夏为全国小麦高产地区之一,但尚有有30％左右的低产田,亩产量在400斤以下,有很大的增产潜力。农村实行大包干生产责任制后,不少农户增产心切,有些地方为提高低产田小麦产量,出现盲目增施化肥的现象,亩施纯氮高达30多斤、40多斤。永宁县1983年每亩化肥成本高达25元左右,占小麦物质成本的50％以上。长期以来领导农业生产缺乏经济效益的观念,不计成本,片面追求高产量;农业科学试验也常以最高产量为主攻目标。由于上述各种原因,造成增产不增收,或增产减收,甚至减产减收。为了实现技术效果和经济效果的统一,研究确定低产田小麦化肥投入最适度的技术经济界限有其现实意义。 Ningxia is one of the high-yielding areas for wheat in the country, but there are still 30% of low-yielding fields with a yield of less than 400 kilograms per mu, which has great potential for increasing production. After the implementation of the responsibility system of producing big bales in rural areas, many peasants are keen to increase their production. In some areas, in order to increase the yield of wheat in low-yielding fields, the phenomenon of blindly applying fertilizers appears. As much as 30 kilos of Mushi nitrogen and 40 kilos of coal are produced. Yongning County in 1983 the cost of fertilizer per acre up to 25 yuan, accounting for more than 50% of the cost of wheat material. For a long time, the idea of ​​leading agricultural production as a result of lack of economic benefits has led to one-sided pursuit of high output regardless of cost and agricultural science experiments have often focused on the highest yield. Due to the various reasons mentioned above, the increase in production will not increase, or the increase in production or decrease in production, or even the reduction in production and decrease in revenue. In order to achieve the unification of technical effects and economic effects, it is of practical significance to study and determine the most appropriate technical and economic boundary for low-yielding wheat fertilizers.