00877nam a2200253ua 4500003001000000005001700010008004100027020001800068040003000086245005700116260010300173490003400276500006000310504004800370650001700418650001700435650001300452650002500465650001500490650002500505655001000530710003900540710004400579AR-SsjUCA20250716140443.0250228s1980    xxu           000 0 eng d  a0-89118-064-8  aAR-SsjUCAbspacAR-SsjUCA00aMoving up the yield curve :badvances and obstacles.  aMadison, WI :bAmerican Society of Agronomy :bSoil Science Society of America,c1980 (reimp.1983)0 aASA special publication ;v39  aProceedings of a symposium .. Chicago,Il. 3-8 Dec.1978.  aBibliografía al final de cada capítulo. 4aBioquímica 4aConferencias 4aCultivos 4aFisiología vegetal 4aNutrientes 4aProducción vegetal 4aTexto2 aAmerican Society of Agronomy. ASA.2 aSoil Science Society of America. SSSA.