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每年一、三、五、七、九、十一月给含磷量低的黄灰——黄棕色过渡性土壤(持磷力为23％)施用过磷酸钙,连续六年之后,测量了多年生黑麦草——白三叶草的干物质产量。施用量为9.5公斤磷/公顷和28.5公斤磷/公顷两种。考察这些处理的效应是在初测试磷量高和低)Truog值分别为8.1和3.1)的土壤中进行的。结果表明,尽管施肥时间会使年产量发生的差异只有4％,但可利用施肥时间来控制季节性产量的平衡。尤其是在最适当的施肥时间七月份施肥,秋季的产量差异能达到8％。然而,这样的效果因高的初测试磷和施用较大量的磷而大大减低。这些结果,有助于肥料工业更好地按照全年需用量来生产。
Each year, March, May, July, September and November to the low phosphorus content of yellow-brown transitional soil (phosphorus content of 23%) application of superphosphate, six consecutive years after the measurement of perennial Dry matter production of ryegrass-white clover. The application rates were 9.5 kg phosphorus / ha and 28.5 kg phosphorus / ha. The effects of these treatments were examined in soils with high and low initial phosphorus levels and with Truog values of 8.1 and 3.1, respectively. The results showed that, although the difference of annual yield would be only 4%, the fertilization time could be used to control the balance of seasonal yield. In particular, fertilizer was applied in July at the most appropriate fertilization time, with a difference of 8% in autumn production. However, such effects are greatly diminished by the high initial test phosphorus and the application of larger amounts of phosphorus. These results help the fertilizer industry to produce better according to the annual demand.