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34 - 35.page10 - NRES 201 Intro to Soil Science Lec 34-35...

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Unformatted text preview: NRES 201 Intro to Soil Science Lec. 34-35 3/17/2010 Practical Soil Fertility Management Ch. 13 Sampling Scale and Location y compromixe: 7 Between What xliould be done, 7 And What can be done (coxt), Collect l compoxite xampk ier25 acrex, 7 5 corex I 1" dia,) per xample, Locate xamplin;r pointx with GPS equipment, Sample from the xame pointx e\'ery time a field ix texted, Soil Fertility Sampling Method of xampling o A l7incli xoil probe ix recommended 0 Automated xoil xamplerx ' " can alm be uxed, Time of xampling o EVery 4 .uarx, o In late xummer or fall, 7 To reduce xeaxonal \" 0 Sample before ap ilyin;r lime or fertilizer, 7 Otlierwixe. you‘ll need to wait a few montlix, Soil Nutrient Extraction i Unificancc: The crucial xtep in any xoil text procedure that determinex xelectiVity: 7 In extimatin;r the plant7a\'ailable form( x) of a nutrient, 7 But not formx that are una\'ailable, Common mil text cxtractantx: Nutrient Extractant FormxrecoVered P NH4F/HC1 (Pl) A17 + Ca7bound P K ‘ Soluble + exchangeable K 10 ...
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