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Estimating the minimum levels of soil nutrients for Japanese red pine, Pitch pine, and Konean Pine.

ѱȰп 1968 1 0ȣ p.23 ~ 33
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Abstract

ҳ, ̱ټ, 㳪 ׾ 򢸦 ϼϿ ٣ ̽Ͽ.
1. ҳ site index() 9, 18, 29̰ ټֿ 25, 32, 35, 㳪 21, 24, 29.
2. ҳ Ҵг Ѧڪ, N, P, K, Ca, Mg, , μ Ÿ.
3. ټ, 㳪 Ѧڪ, , Ҵг μ Ÿ.
4. ҳ, ټ 㳪 Ұ ۰
ҳ :
Y=-5.1+1.1Xo+1.6Xn+0.15Xp+0.34Xc+0.01Xk+0.25Xw
ټ :
Y=10.0+0.12Xo+1.1Xn+0.15Xp+0.34Xc+0.01Xk+0.03Xw
㳪 :
Y=10.3+0.10Xo+1.2Xn+0.15Xp+0.34Xc+0.01Xk+0.04Xw
⼭ Y=Ҵг(cm/year)
Xo= Organic matter(%)
Xn= Potential available nitrogen (ppm)
Xp= Available phosphorus (ppm)
Xc= Clay and silt (%)
Xk= Available potassium (%)
Xw= Water content (%)
5. ׾ .
ҳ : Reaction (pH) 4.1-6.0
Clay and silt (%) 7.00
Organic matter(%) 2.5
Potential available N (ppm) 16.0
Available p (ppm) 1.80
Available K (%) 0.20
Exchangeable Ca (%) 0.100
Exchangeable Mg (%) 0.030
Water content (%) 17.00
ټ : Reaction (pH) 4.3-6.0
Clay and silt (%) 14.00
Organic matter(%) 3.0
Potential available N (ppm) 20.0
Available p (ppm) 1.8
Available K (%) 0.20
Exchangeable Ca (%) 0.100
Exchangeable Mg (%) 0.030
Water content (%) 21.00
㳪 : Reaction (pH) 4.3-6.0
Clay and silt (%) 14.00
Organic matter(%) 3.0
Potential available N (ppm) 17.0
Available p (ppm) 1.8
Available K (%) 0.20
Exchangeable Ca (%) 0.100
Exchangeable Mg (%) 0.030
Water content (%) 20.0
6. ̷ Ÿ 彿 ҳ, ټ, 㳪 Ǿ Ҵг 30cm, 38cm, 36cm ̴.


The aim of the present investigation is to estimate the minimum levels of soil un trients for Pinus densiflora, P.rigida, and P.Koraiensis plantations established on diff erent soils. These stands are subdivided into 3 classes based on the following ranges of site indices:9,18, and 27 in P.densiflora plantations, 25, 32, ane 35 in P. rigida, and 21, 24, and 29 in P. Koraiensis
Results of multipel and simle correlation analysis reveal highlyl significant correlatio n between annual height growth of plantations and soil texture, content of organic matter, potential available nitrogen of available phosphorus. The content of available pot assium, exchangeable Ca and Mg, and water content are significantly incorrelated with height growith in the simple correlations, apparently because they are present in tities above the response limit. The strong effect of potential available nitrogen and a vailable phosphorus, revealed by regression analysis, is of special importance in refore station.The effect of siol constituents on the average annual height growth (Y: cm Year) is expressed by the following regression equation:
Y=-5.1+1.1 Xorganic matter+1.6X availableN+0.15 X available p+0.34 X clay and silt+0.01 Xavailable k+0.25 X water content (P. densiflor plantation),
Y=10.0+0.12 X organic matter X availavleN+0.15 X available p+0.34 X clay and silt+0.03 X water content (P. rigida plantation), and
Y= 10.3+0.10 X organic matter+1.2 X availableN+0.15 X available p+0.34 X clay and silt+0.01 X available k+0.04 X water content (P.Koraiensis plantation).
The minimum levels of soil nutrients for planting P. densiflora, P. rigida, and P. Koraiensis are established on the basis of the average values determined in soil supporting plantations of medium site quality.
These levels of fertility promise an average height growth of 30 cm (in P. densiflora), 38 cm (in P. rigida), and 36 cm (in P. Koraiensis) per year.

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