叶菜型甘薯栽培技术及施氮安全研究

Studies on Cultivation Techniques and Safety of Nitrogenous Fertiliger Application in Vine-vegetable Weetpotato

为了探索叶菜型甘薯高产栽培安全施肥技术以及对其进行产业化开发，采用不同种植密度、不同肥料类型、不同施肥水平以及测定作菜食用部分硝酸盐积累情况等试验，初步明确了中长蔓分枝品种适宜种植密度为每公顷30～33万株，短蔓分枝强的品种适宜种植密度为每公顷27～30万株。施足肥料、多施氮肥时提高茎叶产量和茎叶鲜嫩度有明显效果，多施有机肥、拉长追肥间隔期以及优化配方施肥是降低茎叶硝酸盐含量行之有效的措施；而培育壮苗、合理密植、及时采摘、清洁因地、优化施肥、重施基肥以及加强管理、运用水肥促控技术、调节茎叶生长速度是叶菜型甘薯高产栽培与施氮安全关键技术措施。

In the paper, we observed growth characters of long-length vine, medium-length vine and short-length vine 3 kinds of sweetpotato varieties, and studied the yield of vines and leaves variation in the different densities and different sort of nitrogenous fertilizers. Furthermore, the nitrate amassment changes under different nitrogen level were studied in this experiment. Base on those results, we proposed the high yield cultivation and optimal nitrogen fertilized techniques special use for pick-vine planting.