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999			_c7991 _d7991
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005			20211123053512.0
008			211123b ||||| |||| 00| 0 eng d
040			_aBUL _cBUL _dBUL _beng _erda
082			_a630.2815 _220 _bKLA
100	1		_aKlages, K. H. W., _d1898-1967.
245	1	0	_aEcological crop geography / _cKarl H.W. Klages.
260			_aNew York : _bMacmillan, _c1942.
300			_axviii, 615 p. : _bill. ; _c25 cm.
500			_aCONTENTS PART I : THE SOCIAL ENVIRONMENT OF CROP PLANTS The scope of ecological crop geography The historical background to agricultural production Population in relation to agricultural development Factors determining world centers of population and agricultural production The social environment PART II : THE PHYSIOLOGICAL ENVIRONMNET OF CROP PLANTS The physiological environment External factors in relation to development Physiological limits Crop yields and variability in relation to the ecological optimum Adaptation PART III : THE ECOLOGICAL FACTORS General aspects of moisture relationships Quantitative aspects of moisture relationships Humidity provinces The use of water by plants Special responses of crop plants to the moisture factor Temperature Temperature efficiencies and bioclimatics in relation to crop distribution Light Air Movement Classification of climate Edaphic and physiographic factors PART IV : THE GEOGRAPHICAL DISTRIBUTION OF CROP PLANTS The small grain crops The coarse cereals Edible legumes Potatoes, sweet potatoes, yams and other root crops Sugar Oil producing crops Fiber crops Annual leguminous forage crops Biennial and perennial leguminous forage crops Perennial forage grasses Miscellaneous crops
504			_aIncludes bibliographies.
650		0	_aCrops and climate.
650		0	_aCrop zones.
650		0	_aAgriculture _xEconomic aspects.
906			_a7 _bcbc _coclcrpl _du _encip _f19 _gy-gencatlg
942			_2ddc _cBO _h630.2815 _i1 _kKLA _m630.2815 KLA