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AN IN-SITU TECHNIQUE FOR THE QUANTITATIVE DETERMINATION OF FERTILIZER PHOSPHORUS IN GROWING PLANTS
[摘要] Atechniqueispresentedwhichpermitsthequantitativeestimationoffertilizerphosphorusinplantsatanydesiredtimeduringthegrowthcyclewithoutharvestingtheplants.Theradioactivityofthegrowingplantswasdeterminedinsitubyathin-walledaluminumGeiger-Muellertubeassembly.Thein-situactivitywasfoundtobehighlycorrelatedwiththefertilizer-phosphoruscontent(mg./pot)atanyonestageofgrowthofoats(r = 0.975),corn(r = 0.966),andsugarbeets(r = 0.813).Therelationshipbetweenthein-situactivityandthefertilizer-phosphoruscontentvariedwithplantheight.Regressionequationsarepresentedrelatingthefertilizer-phosphoruscontenttothein-situactivityandplantheight.Correlationcoefficientsfortheregressionequationswere0.943,0.914,and0.902foroats,corn,andsugarbeetsrespectively.Thecoefficientofvariationofthefertilizer-phosphoruscontentofsugarbeetsusingtheregressionequationwas15.3percent,whereasthatusingthebriquettechn...
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[效力级别]  [学科分类] 农业科学(综合)
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