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,P_2O_5 100—200kg。N与P的比例为N=3-2,P_2O_5=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％。
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 ^(15)N and ^(32)P.
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 P_2O_5 100-200kg/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.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1989年第5期401-409,共9页
Scientia Silvae Sinicae
关键词
侧柏
播种苗
施肥
氮
磷
钾
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 response surface.
