3 YEARS EXPERIENCE WITH AN ON-FARM MACRO-CATCHMENT WATER HARVESTING SYSTEM IN BOTSWANA

被引：39

作者：

CARTER, DC

MILLER, S

机构：

[1] BOTSWANA DEPT AGR RES,GABORONE,BOTSWANA

[2] LAND & WATER MANAGEMENT PROJECT,GABORONE,BOTSWANA

来源：

AGRICULTURAL WATER MANAGEMENT | 1991年 / 19卷 / 03期

关键词：

D O I：

10.1016/0378-3774(91)90041-G

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

An on-farm macro-catchment water harvesting system was evaluated over three distinctly different seasons in eastern Botswana. Water harvesting improved sorghum grain yield two- to threefold during seasons with low or poorly distributed rainfall. Greater yields were associated with higher pre-planting soil moisture, higher profile soil moisture, higher water use, and a larger and deeper root system. Storms with a minimum of 20 mm day-1 rainfall were associated with runoff volume exceeding 1000 m3. The probability of receiving such a storm annually during pre-planting, heading and flowering, and grain fill periods exceeded 80%. The catchment/cultivated area ratio was between 17:1 and 50:1.

引用

页码：191 / 203

页数：13

共 9 条

[1]

Bhalotra YPR, 1987, CLIMATE BOTSWANA 2, V1

[2]

BIOT Y, 1988, THESIS U E ANGLIA UK

[3] THE SUCCESSFUL FLOODWATER FARMING SYSTEM OF THE SABEANS, YEMEN-ARAB-REPUBLIC [J].