洋芋,是榆林地区主要种植作物之一,它是一种比较耐旱和耐瘠薄的作物,产量一般较高较稳.在干旱的情况下,也可获得较好的收成.目前榆林地区把沙杂15号良种列为主要推广洋芋品种之一.在近两年严重干旱的考验下,表现出抗旱性强,长势好,增产效果显著.为了进一步摸索沙杂15号洋芋良种增产的有效措施,1973年我们进行了试验.试验均设在阳坡老梯田,每亩施圈肥1500斤,施碳酸氢铵10斤,一般每亩3000株,除播种期试验外,其它试验在5月8—10号播种. Potato, Yulin is one of the main planting crops, it is a more drought-tolerant and infertile crops, the yield is generally higher and stable in the case of drought, but also get better harvest now Yulin area sand Hybrid variety No. 15 was listed as one of the main varieties of potato varieties in the past two years under the test of severe drought, showing strong drought resistance, growth is good, a significant increase in yield.In order to further explore Shapot 15 effective varieties of potato cultivation, We conducted the test in 1973. The experiments are on the sunny slope of the old terraced fields, applying 1500 kg of fertilizer per acre and applying 10 kg of ammonium bicarbonate, generally 3000 plants per acre. Except for the sowing test, the other tests were conducted on May 8-10 No. sowing.