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黔西北地区包括威宁、赫章、纳雍、毕节、大方等县全部,以及盘县、织金、黔西等县的一部分.地势高亢,海拨在1500米到2400米之间.气候冷凉,年均温在15℃以下,素有高寒山区之称.该区耕地主要是黄泥土与灰泡土.土壤在未改良前,大都具有酸性重、养分缺乏、供肥力低、物理性不良等特性,作物生长不良,单产很低.长期来,当地农民在改变低产斗争中,积累了用石灰改良土壤的经验.近年来,用石灰改土的面积逐年扩大,施用量也有逐渐增加的趋势,有些社、队施用量甚至超过万斤/亩.这样就产生了一个问题:即在黔西北条件下,
Northwestern Guizhou includes Weining, Hezhang, Nayong, Bijie and Dafang counties, as well as part of Counties, Zhijin and Qianxi counties, with high terrain and an altitude of 1,500 to 2,400 meters. Cool, the annual average temperature below 15 ℃, known as alpine mountain.The farmland in this area is mainly yellow soil and gray soils.The soil before unmodified, most with acidic weight, lack of nutrients for low fertility, poor physical And other characteristics, poor crop growth, yield is very low for a long time, the local farmers in the struggle to change the low yield, has accumulated experience in improving the soil with lime in recent years, the area of lime soil has been expanding year by year, the application rate has also gradually increased , Some clubs, the team applied even more than kilograms / mu. This creates a problem: that is, in the northwest of Guizhou,