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198 1～ 1998年在黄潮土上进行肥力定位试验 ,结果表明 :黄潮土连续 18年施用磷肥 (每年施15 0 kg/ hm2 P2 O5 的过磷酸钙 ) ,磷肥的年表观利用率随施肥年限延长而增长 ,试验 13年后趋于稳定 ;磷肥在小麦、玉米上的养分生产力 (Y)与施肥年限 (x )呈二次方程关系 :Y小麦 =- 15 .0 0 2 + 11.0 77x - 0 .5 5 3x2 (r=0 .95 32 **) ;Y玉米 =- 8.5 0 3+ 5 .6 2 1x- 0 .2 74x2 (r=0 .980 1**) ,显示出磷肥残效的叠加效应。在该试验条件下 ,由于 NP处理配施有机肥带入的磷量较高 ,磷肥肥效则有所下降。黄潮土中磷肥肥效与土壤速效磷 (olsen P)含量呈极显著负相关 :Y(小麦当季表观利用率 ) =199.40 9x- 0 .70 9(r=- 0 .9382 ** ) ;Y(小麦增产 ) =6 5 .894- 2 .6 0 5 x(r=- 0 .935 3** ) ,x为速效磷含量。
Fertilization experiment was conducted on the yellow soil in 1998-1998. The results showed that the annual apparent application rate of phosphate fertilizer increased with the fertilization period when the phosphate fertilizer (150 kg / hm2 P2 O5) And the experiment tended to be stable after 13 years. The nutrient productivity (Y) of phosphate fertilizer on wheat and maize showed a quadratic relationship with the fertilization period (x): Y wheat = - 15.0002 + 11.0 77x -0.5 5 3x2 (r = 0.95 32 **); Y corn = - 8.5 0 3+ 5 .6 2 1x- 0 .2 74x2 (r = 0.980 1 **), showing the additive effect of phosphate residuals. Under the experimental conditions, due to NP treatment combined with organic fertilizer to bring the phosphorus content is higher, phosphate fertilizer efficiency decreased. There was a significant negative correlation between the fertilizer efficiency and the content of olsen P in the yellow soil: Y (apparent occupancy rate of wheat in the season) = 199.40 9x -0.79 (r = -0.9382 **); Y ( Wheat yield) = 65.894-2.660 × (r = -0.935 3 **), and x is the available phosphorus content.