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作 者 ：沈佐 孙时轩 屠泉洪

期 刊 ：林业科学 1989年 25卷 5期 页码：401-409

关键词：侧柏播种苗；苗圃地施肥；最佳N；P比例；最佳施肥量；产量反应曲面方程；

Keywords:Platycladus orientalis (Linn) Franco seedling, Application of fertilizers in nursery ground, The best proportions of N and P, The optimal quantities of fertilizers to be applied, Equation of yield,

摘 要 ：我们给侧柏播种苗用过磷酸钙作基肥,等幼苗出土后用氮和钾作追肥。用⁽¹⁵⁾N及⁽³²⁾P示踪测定幼苗开始吸收N与P的时期。结果:(1)侧柏一年生播种苗,凡施N的处理苗木质量都有明显地提高;(2)磷对侧柏苗的作用次于氮,但磷、氮配合使用效果更好;(3)在本试验地培育侧柏播种苗,产合格苗210万株/ha,最佳施肥量每公顷N 150—200kg,P₂O₅ 100—200kg。N与P的比例为N=3-2,P₂O₅=2-1,N+P=300—400kg;(4)侧柏苗在生侧根之前即能吸收P和N;(5)科学施肥使合格苗产量与经济效益都比对照提高81.3—99.7%。

Abstract:Studies on the influence of proportion and amount of N, P and K on grouth of Oriental arborvitae (_{Platycladus orientalis} (Linn) Franco) seedling (1+0) were made.Seeds were sown on seedbed in nursery. Calcium Superphosphate was used as ground fertilizer and N and K as additional fertilizers after emergence of the seedlings. The time of absorbing N and P by the seedlings was traced by radioactive isotopes ¹⁵N and ³²P.The results are: (1) the 1-year old seedling reacted readily with N-fertihzer. Growth of the seedling was significantly increased. The most satisfactory result occurred when N was applied with P. (2) In effect P was only next to N and was necessary to obtain the maximum quantity of up to standard seedlings to achieve the best monetary result. (3) The optimal quantities of fertilizers to be applied was N 150-200kg/ha and P₂O₅ 100-200kg/ha for production of 2.10million qualified seedlings per hectare. The best proportions for N and P on moist loess soil in our experiment were 3—2 to 2—1. N+P=300—400kg. (4) N and P could be absorbed by the seedlings before lateral roots appeared. (5) Application of fertilizers would increase by 81.3%—99.7% of seedling production and economic benefit respectively over comparison.

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