Effect of Soil Compaction on the Early Growth of Herbage Plants

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Effect of Soil Compaction on the Early Growth of Herbage Plants

その他（別言語等）

のタイトル

土壌の堅密性が牧草の初期生長におよぼす影響について

著者（英） Ohtomo Koichi, Tomiya Naohiro, Mino Yosuke, Sakai Ryutaro

journal or

publication title

Research bulletin of Obihiro Zootechnical University. Series I

volume 11

number 3

page range 491‑497

year 1979‑11‑20

URL http://id.nii.ac.jp/1588/00002238/

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Res. Bull. Obihiro Univ.

，

11 (1979): 491""'497.

Effect of Soil Compaction on the Early Growth of Herbage Plants

Koichi OHTOMO

グ

NaohiroTOMIYA，間 Yosuke MINO喝号

and Ryutaro SAKAI生時

伊

Laboralory01 Farm Power and Tractors

，

and^器長Laboratory01 Environmental Bot酎ty，Obihiro University 01 Agriculture and Velerinary

Medec問e

，

Obihiro

，

Hokkaido

，

Japan) Received May 26， 1979

土壌の堅密性が牧草の初期生長におよぼす影響について大友功一 * ・富谷尚博同 . 美濃羊輔林・酒井隆太郎糾

Introduction

491

Several workers^l‑G

，

lト 16)have reported about the growth of various crops on soils of di旺erentbulk densities， but we have only a few studies on the behavior of herbage plants⁸，的 Grasslandis generally utilized OVer a long period of time without renovation after it is established. The soils in grassland are therefore solidified gradua

l 1

y by grazing of animals， running of large‑sized farm machines， compaction of soil itself and so on. In a previous model experiments⁸¥ we demonstrated that the early root growth of some herbage plants decreases with increasing soil compaction. The present study was attempted to examine how the morphological aspects of herbage plants vary with soil compaction on the field level

Materials and Methods Plant mate円als

The plants used were orchardgrass (Dactylis gl酬 erata

L . ) ，

1

^回

l

泊

n ryegrass (Loli

u .

m

1n

ultiflor^{仰包} Lamark)，alfalfa (Medicago satilla

L . )

and ladino

c 1

0ver (Trifolium re世間s

L . )

Design of

叫世e

rz問entalρloisand sowing

The soils (dry volcanic ash soil) of di旺erentbulk densities (0‑5 cm from soil surface) were made in the experimental farm using a ro

l 1

er as sho附n in Fig. 1. Bulk densities 1. 00

， 1 . 27 and 1 . 3

5 were expressed as low (L)

，

moderate

仏

A)and high (H)

，

respectively Sochi‑nigo (N: P20

， :

K20

，

6: 11: 11) was fertilized

加

eachplot (12 kg/

司

Themixture

普

帯広畜産大学農業工学科農業動力学研究室時帯広畜産大学畜産環境学科環境絹物学研究室

111

ー

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Effect of Soil Compaction on the Early Growth of Herbage Plants