EFFECTS OF SUBSOIL LOOSENING ON SOIL PHYSICAL-PROPERTIES, PLANT-ROOT GROWTH, AND PASTURE YIELD

被引：27

作者：

HARRISON, DF ^{[1
]}

CAMERON, KC ^{[1
]}

MCLAREN, RG ^{[1
]}

机构：

[1] LINCOLN UNIV,DEPT SOIL SCI,POB 84,LINCOLN,NEW ZEALAND

来源：

NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH | 1994年 / 37卷 / 04期

关键词：

SUBSOILING; PASTURE; BULK DENSITY; POROSITY; HYDRAULIC CONDUCTIVITY; DRAINAGE; ROOTS; YIELD;

D O I：

10.1080/00288233.1994.9513095

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

Subsoil loosening of an 8-year-old dryland pasture soil (Templeton silt loam) at either of two depths (27 or 47 cm) resulted in a significant (P < 0.1) decrease (>10%) in soil bulk density and a concomitant increase in soil porosity compared with undisturbed soil. The hydraulic conductivity of the loosened soil was significantly (P < 0.05) greater than that of the undisturbed soil, reflecting the increased pore continuity within the depth of loosening. These more rapid drainage rates resulted in a drier soil profile at the start of spring, 10 months after subsoil loosening. These improved soil physical conditions permitted more rapid root growth and the development of a more extensive pasture root system with a significantly (P < 0.1) greater (36%) root length below 30 cm depth. Subsoil loosening resulted in significant increases in pasture production over the first 3 months of spring (August-October).

引用

页码：559 / 567

页数：9

共 37 条

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