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油菜是我省的主要油料作物之一,常年种植面积400万亩左右,产量较低。合理施肥是夺取丰产和优质的关键措施。 一、油菜的需肥特点 油菜根系发达,吸收能力强,需肥多且耐肥,对养分供应不足敏感。对氮、磷的需要量约为禾本科作物如小麦、玉米的三倍以上。我省油菜为越冬作物,苗期时间长,约占整个生育期的五分之三,历时130-140天,该期吸收的氮占全生育期的44％,磷20％,钾24％;蕾苔期历时30天,是营养生长与生殖生长两旺时期,干物质积累快,吸收的氮占全生育期的46％,磷22％,钾54％;开花至成熟期,以生殖生长为主,至逐渐停止生长,历时约30天,吸
Rape is one of the major oilseed crops in our province. The perennial planting area is about 4 million mu and the output is low. Rational fertilization is the key measure to seize high yield and high quality. First, the need for fertilizer rapeseed Rape roots developed, strong absorption capacity, to be fat and more fertilizer, sensitive to nutrient shortage. The demand for nitrogen and phosphorus is about three times that of gramineous crops such as wheat and corn. The rapeseed in our province is overwintering. The seedling time is long, accounting for about three fifths of the whole growth period, which lasted for 130-140 days. The nitrogen absorbed during this period accounted for 44% of the whole growing period, 20% of phosphorus and 24% of potassium. Siberian period of 30 days, vegetative and reproductive growth is thriving, rapid accumulation of dry matter, absorbed nitrogen accounted for 46% of the whole growth period, phosphorus 22%, potassium 54%; flowering to maturity, reproductive growth as Lord, to gradually stop growing, which lasted about 30 days, sucked