杨树速生丰产配方施肥试验

对3年生南林351杨(Populus deltoides 'Lux'×P. deltoides 'Harvard')进行田间配方施肥试验,研究了不同N、P、K配方施肥对杨树生长的影响作用.结果表明,N、P、K配方施肥对杨树生长具有明显的促进作用,其中,每株130g N、80g P、80g K的施肥处理对杨树胸径、树高的增长作用最为明显,其材积较对照增长53.9%.回归分析表明,杨树胸径生长和材积生产适宜的N、P、K用量分别为119.14、58.80、29.73和132.24、68.34、29.49g,相应的合理N、P、K营养配比为14: 7: 4.因此,每株杨树施用尿素259.57～287.48g、过磷酸钙490.00～569.50g、硫酸钾65.83～66.36g,或者直接施用14-7-4复合肥900g/株,能够促进杨树速生丰产.

Formulated Fertilization for Fast-growing and High-yield Poplar Plantation

The responses of the growth of 3-year-old Populus deltoides ' Lux' ×P. deltoides ' Harvard' seedlings to N, P and K fertilizer in soil were studied on the base of a relative experiment of formulated fertilization. Results showed that the formu-lated fertilization had obvious effects on promoting the growth of poplar. The application of N( 130 g) , P(80 g) and K(80 g) per seedling exhibited the most significant promotion effect on diameter at breast height and seedling height, and the volume increased by 53.9% compared with that of the control. Regression analysis showed that the optimal application a-mounts of N, P and K were 119. 14, 58.80, 29.73 g for the growth of diameter at breast height and 132.24, 68.34, 29.49g for the growth of volume, respectively, and the optimum proportioning of N, P and K was 14:7: 4. Therefore, the feasible ranges of urea, superphosphate and potassium sulfate for the cultivation of fast-growing and high-yield poplar are 259.57～287.48, 490.00～569.50 and 65. 83～66.36 g per seedling, or directly apply 900 g compound fertilizer with N, P, K at a concentration ratio of 14:7:4 per seedlings.