论文部分内容阅读
夏甘薯扦插早晚,是决定甘薯产量高低的一个基本因素。据前华东农科所试验:6月19—21日栽的,单产2,020.2斤,7月9—11日栽的,单产1,061.2斤,晚栽20天,减产将近50%。除因秧苗供应不上及劳畜力缺乏,割麦后不能及时整地等原因,造成晚栽而外,在旱作地区,6月上中旬的气温高土壤干旱,扦插后不能成活,往往是夏甘薯晚栽的一个最主要同时也是较难克服的原因。
Sweet and sour potato cuttings sooner or later, is to determine the level of sweet potato production is a basic factor. According to the East China Institute of Agronomy test: June 19-21 planted, yielding 2,020.2 pounds, July 9-11 planted, yielding 1,061.2 catties, 20 days late planted, nearly 50% reduction in production. In addition to the lack of supply of seedlings and labor shortage, cutting the wheat can not be timely and other reasons, resulting in late planting outside, in dry areas, in mid-June high soil temperature drought, cuttings can not survive, often sweet potato Late planting one of the most important but also difficult to overcome the reasons.