Diagnosis and Improvement of Acid Soils

Diagnosis and Improvement of Acid Soils Diagnosis and Improvement of Acid Soils Sample PDF Download
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Publisher: Agrotech Publications
ISBN: 9788183211260
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PREFACE The largest reserves of potential arable land still available in the world are acid soils. Acid soils, estimated at more than 800 million ha worldwide, constitute from 40-50 of potentially arable highly weathered soils. These soils are located primarily in the tropics and subtropics, where intense mical weathering occurs. e outcome of the race between world food production and jopulation will largely determined in the tropics, where most of the vorld s undernourished people live. There are three avenues for ncreasing food production in the tropics increasing yields per unit irea in presently cultivated regions, opening new lands to ultivation, and expanding irrigated land. The first two require the lleviation or elimination of soil constraints, while the third liminates water stress as the main constraint limiting crop roduction. All the three alternatives are needed. According to AO estimates, increasing yields on lands already in use is not ifficient, and additional land must be incorporated into agricul11 ire to accomplish this goal. Making efficient use of acid soils is one 'the most important option to achieve the goal.
ost well drained tropical soils, which are not currently used for jriculture, are acid. This is not generally true for soils presently ider cultivation because since man started to grow crops he has ways tended to settle on high base status soils. tid soils are developed under high rainfall conditions and, icause of their specific nature, pose several problems for cessful crop production. The various aspects of management of id soils have therefore, attracted the attention of several research irkers during last fifty years. humid climates, weathering and leaching processes lead sooner
Diagnosis and Improvement of Acid Soils
or later to natural acidification of permeable soils unless airborne salts are deposited or counteracting measures are taken by man. The, acid soil infertility is a major limitation to crop production on highly weathered and leached soils in both tropical and temperate regions of the world. In addition, soil acidification caused by leaching with acid precipitation an outcome on industrial expan sion is a subject causing increasing concern. Apart from the above process, application of acid forming fertilizers, decomposing plant residues and organic wastes contribute quite a bit to acidity. Soils may also be acidic when derived from acidic parent material or materials initially low in the basic cations Ca , Mg , K and Na . The acid soils represent the largest land reserve available for