YIELD OF SOYBEANS AND OIL QUALITY IN RELATION TO SOIL TEMPERATURE AND MOISTURE IN A FIELD ENVIRONMENT

[摘要] Undercomparablefieldconditionsofairtemperatureandsolarradiation,yieldofsoybeansincreased43.4%whentheday-degreesunitsofthesoilwereraisedfromaseasonalvalueof859to1822(gt; 5 C)andyielddecreased82.4%whentheday-degreesforthesameperiodwereloweredto408forthe20-cmdepth.TheseheatvaluesfromJuly10toSeptember21correspondtomeandailysoiltemperaturesof11.2,17.7,and31.2 C.Thechangeinyieldrepresentsareductiononthecoldsoilsof208 kg/ha(3.1 bu/acre)per1degreeCbelowtheseasonaltemperature,andanincreaseonthewarmplotsof54 kg/haper1degreeC(unfertilized)abovetheseasonaltemperature.Ingeneral,yieldwasrelatedlinearlytothereciprocalofthetemperatureandoftheday-degrees.Oilconcentrationvariedlittleamongthethreesoiltemperatures,althoughtheiodinenumberdecreasedandthepercentageproteinincreasedwithhighersoiltemperature.Coincidingwiththehighyieldsonthewarmsoilswasahighconcentrationof...

[学科分类] 农业科学（综合）