南安市丘陵旱地甘薯氮磷钾适宜配比的研究

Study on the suitable rate of NPK fertilizer to sweet-potato on hillside droughty of Nan'an city

通过在南安市丘陵旱地三种不同类型土壤上布置"3417"设计的平衡施肥田间肥料试验,验证NPK肥的施用效果,建立甘薯产量和施肥利润与N、P、K施用量的数学模型,得出在该条件下的甘薯适宜施肥量和比例。结果表明,甘薯施用NPK肥料均获得一定幅度的增产增值效果。获得最高产量的施肥量为154 3～173 6kg/hm2N,44 4～75 3kg/hm2P2O5,193 1～245 3kg/hm2K2O,N P2O5 K2O=1 0 26～0 43 1 24～1 41;最佳经济施肥量为140 0～162 0kg/hm2N,40 8～67 0kg/hm2P2O5,199 8～227 3kg/hm2K2O,N P2O5 K2O=1 0 25～0 41 1 23～1 64。低产田土壤适当增施N肥,P、K比例可以低些,中高产田土壤P、K比例要高些。

Field experiments were carrid out on three different soil types in droughty area of coastal hillside of Nan'an city with'3417'fertilizer experiment desige.The result showed that the fertilization of nitrogen ,phosphorus,potassium was important to improve yield and profit of sweet-potato.Through mathematical calculation and analysis,the aim yield at 32441.5～41427.1 kg/hm^2 was gained,the optimum programme would be 154.3～173.6 kg/hm^2 of N,44.4～75.3 kg/hm^2 of P_2O_5,193.1～245.3 kg/hm^2 of K_2O,the rate of N?P?K at 10.26～0.431.24～1.41.The aim profit at 15116.6～19454.8 Yuan/hm^2 was gained,the optimum programme would be 140.0～162.0 kg/hm^2 of N,40.8～67.0 kg/hm^2of P_2O_5,199.8～227.3 kg/hm^2 of K_2O.The rate of N?P?K at 10.25～0.411.23～1.64. The lower yield soil should use nutroger fertilizer more than midll-hight yield soil.