000			00467nam a2200169Ia 4500
008			130910s9999 xx 000 0 und d
020			_a0121598500
041			_aeng
082			_221st ed. _a631.558 _bBIO
245			_aThe biology of crop productivity _cedited by Peter S. Carlson
260			_aNew York : _bAcademic Press , _c1980
300			_axvii, 459 p.
504			_aIndex: p. 461-71.
653			_aCrop science
700			_aCarlson, Peter S., ed.
942			_cEN _2ddc
999			_c7527 _d7527