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Variation Character of Grain Yield per Unit Area in Main Grain-producing Area of Northeast China 总被引：1，自引：0，他引：1
CHENG Yeqing ZHANG Pingyu ZHANG Huimin 《中国地理科学(英文版)》2007,17(2):110-116
Based on the surveys and the statistic data during 1980-2003, the variation character of grain yield per unit area in Northeast China and its main factors have been discussed by the methods of statistics and grey correlation analysis. The results show that: 1) the grain yield per unit area has been taking on an increasing trend in the recent 20 years. It increased from 2519.80kg/ha in 1980 to 4216.11kg/ha in 2003, with an increasing rate of 67.32%; 2) the variation of grain yield per unit area is considerably prominent and its range is also very great, with the maximal increase rate of 42.59% and maximal decrease rate of 21.13%, respectively, which are far above the whole Chinese average level; 3) the variation of main crops' yield per unit area is remarkable, which takes on the character that the yield of corn is much higher than that of soybean and rice; and 4) the grey correlation analysis shows that the most important factors impacting the variation of grain yield per unit area are the total power of agricultural machinery, the consumption of chemical fertilizer and effective irrigated area. However, the influence of natural disaster and income level should not be ignored. Effective ways to improve grain yield per unit area are to construct farmland improvement groundwork, reclaim the middle- and low-yield farmland, etc. 相似文献
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“你们看,那是项目区外的一片地,那里的冬瓜长势就没有项目区内的长势好,因为冬瓜喜肥、喜水,项目区内的机井多,又架了电线,浇地非常方便,所以今年的冬瓜喜获丰收,每亩产量大约在2万多斤,每亩纯利润比种玉米多收800元左右,这是土地整理项目给我们带来的实实在在的实惠。”日前,在沁阳市葛村土地整理项目区,一位瓜农手持1米多长的大冬瓜,脸上洋溢着丰收的喜悦。和他一同分享这喜悦的, 相似文献
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对于广东乐昌市沙坪镇南洞村的村民而言,“石漠化”也许是个新鲜的词。
南方本应是多雨地区,却饱受干旱之困;同样是种植黄烟,这里的亩产量却明显低于其他地区。就连最耐旱、高产的玉米,年产量也仅几百斤,还不够喂大一头猪;粮食不够吃,村民只好上山挖野莱充饥：马蹄草、剪刀草、小油菜…… 相似文献
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“你们看,那是项目区外的一片地,那里的冬瓜长势就没有项目区内的长势好,因为冬瓜喜肥、喜水,项目区内的机井多,又架了电线,浇地非常方便,所以今年的冬瓜喜获丰收,每亩产量大约在2万多斤,每亩纯利润比种玉米多收800元左右,这是土地整理项目给我们带来的实实在在的实惠。”日前,在沁阳市葛村土地整理项目区,一位瓜农手持1米多长的大冬瓜,脸上洋溢着丰收的喜悦。和他一同分享这喜悦的, 相似文献
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