论文部分内容阅读
水稻是眉县的主粮之一,属华北单季稻作带。近年来种植面积约13000多亩,有逐年缩小趋势。亩产徘徊在400—500斤。为了探讨低产的原因,本文仅就眉县气候条件与水稻生产的关系作初步分析。一、水稻生育期有关的气候因素 (一)育秧期:根据眉县气候资料,育秧期≥10℃积温以630—700℃为宜。自1959—80年22年中出现小于600℃的共3年,平均每亩减产在30斤以上。特别是1960年≥10℃积温为292.1℃,稳定通过初日延至5月9日,当年减产162.7斤。通过典型丰、歉年对比,典型丰年平均≥10℃积温多于典型歉年93.2℃,平均每天高出2.3℃。由此说明,苗期温度偏高是培育壮苗的关键。水稻播期温度极不稳定,
Rice is one of the main staple foods in Meixian County, which belongs to the single-crop rice belt in North China. In recent years, planting area of about 13000 mu, decreasing year by year. Hectares hovering at 400-500 pounds. In order to explore the reasons for low yield, this paper only preliminary analysis on the relationship between Meixian climatic conditions and rice production. First, the rice growth period related to climate factors (a) nursery: According to Meixian climate data, seedling ≥ 10 ℃ accumulated temperature to 630-700 ℃ appropriate. Since 1959-80 22 years less than 600 ℃ in a total of 3 years, an average of more than 30 pounds per mu yield reduction. Especially in 1960 ≥10 ℃ accumulated temperature of 292.1 ℃, stable through the first day of extension to May 9, then cut 162.7 kg. Through the comparison of typical abundance and poor year, the accumulated average temperature of ≥10 ℃ in typical rich year is more than the typical apathy of 93.2 ℃, and the average daily temperature is higher than 2.3 ℃. This shows that the high seedling temperature is the key to nurturing seedlings. Rice sowing temperature is extremely unstable,