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1962年在贺兰山下淡灰鈣土上试种甘薯,获得成功。2分地,共收了八、九百斤甘薯(合亩产4,000多斤)。主要栽培措施,不过是施牛粪200斤,草木灰400斤,两次追施硫铵20斤,中耕培土2次,灌水3次。获得成果的原因,在很大程度上是自然条件较为适宜。该地区6～9月的溫度,为18～25.5℃,适于甘薯生长。昼夜溫差较大,有利于甘薯水分养分的吸收和积累。6～7月,10厘米內的地溫为26.9～27.4℃,对块根膨胀非常有利。但4～5月份的溫度较低,为18～19℃,如何育苗是一个关鍵问題。此外,光照较为充裕,有利植物的光合作用。甘薯生长期的5～9月,光照时数比北京多2.235个小时,晴天日数多34.6天,因此甘薯生长发育较好。甘薯生长期间,所需水量约为450毫米,而本区5～9月的降水量仅有160毫米左右,相
In 1962 Xia Helan mountain under the light gray soil try sweet potato, to be successful. 2 points, received a total of eight, nine hundred pounds of sweet potato (mu yield 4,000 kilos). The main cultivation measures, however, is to apply 200 kg of cattle manure, 400 kg of ash, two times the topdressing 20 kg of ammonium sulfate, soil cultivation 2 times, irrigation 3 times. The reason for the achievement is to a large extent the natural conditions are more appropriate. The temperature from June to September in this area is 18 ~ 25.5 ℃, suitable for sweet potato growth. Large temperature difference between day and night, is conducive to sweet potato moisture absorption and accumulation. From June to July, the geothermal temperature within 10 cm was 26.9 to 27.4 ° C, which was very favorable for the expansion of tuberous roots. However, from April to May the temperature is low, 18 ~ 19 ℃, how nursery is a key issue. In addition, the light is more abundant, beneficial plant photosynthesis. From May to September in the sweet potato growing season, the number of hours of illumination was 2.235 hours more than that of Beijing and the number of sunny days was 34.6 days, so the sweet potato grew well. During the sweet potato growth, the required amount of water is about 450 mm, while precipitation in this area from May to September is only about 160 mm,