【摘要】 在三个地区不同速效磷含量的土壤进行田间小区试验,调查油菜籽产量对磷肥用量的反应。结果表明,在低磷肥用量时,菜籽产量与磷肥用量呈线性正相关,获得菜籽最高产量的最少磷肥用量在22.5～45(50)kg/亩的范围内,依土壤速效磷含量的不同而异。磷肥用量超出线性区,即进入饱和区时,增加磷肥用量对菜仔产量无明显影响。超过饱和区的磷肥用量,菜籽产量降低。根据试验结果,最适磷肥用量(y,kg/亩)可根据土壤速效磷含量(x,mg/kg)依模式y=51.22-1.43x推出。本试验还在盆裁条件下调查了土壤速效磷含量、油菜菡含磷量,总吸磷量及干物产量与施磷量的关系,并调查田间油菜苗磷含量和土壤速效磷含量关系。更多还原

【Abstract】 Field trials were carried out for 2 years in soils with different concentrations of available phosphorus in 3 areas in order to investigate response of oilrape seed yield to application rates of phosphorus fertilizer.The seed yield was proportionally increased with the increasing amount of phosphorus applied at low application rates. The optimum rates of phosphorus supply were found in the range of 22.5—5 Kg mu^-1, depending on the concentrations of available P in soils. As P supply exceeded optimum rates, no further responses of seed yieid to the rates of P supply were observed, which may be called P saturated area while significant reduction in seed yield occurred at high application rates of P fertilizer, i, e, toxic level. The relationship between optimum rate of P fertilizer （y） and the concentrations of available P in soils （X） can be expressed with the following empirical equation: y=51.22—1.43X. The relationships between available P in soils, P content in seedlings, total P in seedlings, dry-matter weight and levels of P supply were investigated under pot cultural conditions. It was found that P content of winter rape seedlings in the fields related linearly to the available P in soil.更多还原