000			01574nab a22003617a 4500
001			G49482
003			MX-TxCIM
008			121211b |||p||p||||||| |z||| |
040			_aMX-TxCIM
041	0		_aEn
043			_aNL
072		0	_aF00
072		0	_aF10 U10
082	0	4	_a81-652161
100	1		_aChen, S.C.
245	0	0	_aCorn yield model for Ribeirao Preto, Sao Paulo State, Brazil
260			_c1980
340			_aPrinted
500			_a15 ref.; Summary (En)
520			_aThe effects of weather and technology on corn (Zea mays L.) yield in the district of Ribeirao Preto were studied by a correlation analysis. The most important monthly meteorological factor affecting corn yield is total evaporation, which has significant correlation coefficients in five of the six study months. All meteorological factors used for analysis are significant in December, indicating that this is the critical month for corn production. Technology improvements during the period 1957 to 1975 also play a significant role in corn yield and explain more than 45 per cent of yield variation. The best yield-weather-technology (YWT) model for corn
546			_aEnglish
591			_aCOMOD
595			_aAC
650	1	0	_aBrazil
650	1	7	_aMaize _gAGROVOC _2 _91173
650	1	0	_aMathematical and statistical methods
650	1	0	_aMeteorology and climatology
650	1	0	_aPlant production _91212
650	1	0	_91314 _aZea mays _gAGROVOC
700	1		_aDa Fonseca, L.B., _ecoaut.
773	0		_tAgricultural Meteorology _n81-652161 _gv. 22, no. 3, p. 341-349
942			_cJA
999			_c14220 _d14220