[B] Soil A Living System
[B] Soil A Living System SoilS 201
Popular in Course
Popular in Soil Science
This 13 page Class Notes was uploaded by Miller Mayert on Thursday September 17, 2015. The Class Notes belongs to SoilS 201 at Washington State University taught by John Reganold in Fall. Since its upload, it has received 18 views. For similar materials see /class/206004/soils-201-washington-state-university in Soil Science at Washington State University.
Reviews for [B] Soil A Living System
Report this Material
What is Karma?
Karma is the currency of StudySoup.
Date Created: 09/17/15
Determining Fertilizer Needs Expe ence Visual deficiency symptoms Soil samples Plant tissue samples Visual Deficiency Symptoms Want to avoid getting to this stage Different nutrients relatively mobile or immobile within plants Mobile nutrients show symptoms first in old leaves K Mg N S lmmobile nutrients show symptoms first in young leaves and at growing points Fe Mn Zn B Chlorosis Yellowing Of whole plant or old leaves N or S deficiency Lack of light old or waterlogged lnterveinal Fe Mn Zn Cu deficiency Mg deficiency Purpling Accumulation of anthocyanin pigments Overall dark green with purple blue or red tint P deficiency Al toxicity drought Local Necrosis Tissue death Necrotic spots patches or margins K deficiency Sometimes deficiency of M0 or Cl Drought Frost Salt damage Stunting Need normal plant nearby for comparison Leaves orwhole plant not grow to normal adult size OR stem not elongate and terminal leaves bunch up rosetting Zn deficiency r Death ofgrowing points B deficiency How much fertilizer Consider Efficiency Release rates Residual nutrients Recommendations Inefficiency of Inorganic Fertilizers Not everything applied is taken up by crop Some lost to microorganisms Some lost to leaching eg nitrates and volatilization eg urea anhydrous ammonia etc ill F l6 i 4 Source of Nitrogen in Corn Plants Grown in North Carolina on an Enon Sandy Loam Soil Um Hapludalf Ferllllzed With Three Rates of Nitrogen as Ammonium Nitrate 39I39llc39 mum39 0 hr nitrogen in tho mm plant was determiner by using fertilizer lagged with the isotope 395N Moderate fi39rlilizcr use lm rmsr d tln39 uptake of N already in the sail system as well as that derived from the fertilizer I mHim Zorn grain Till N in Forilizurllurlvcd Soillurivml Fertilizertinier N in Fertilizerderived N Hungu uIIllml yIurl mm plant N in turn N in mm cum as percent of in corn as percent of lgIm MgIm kxIm kxlm kgIm mm N in corn N applied 50 39 85 28 60 33 56 100 46 146 55 91 38 55 200 55 l57 86 71 55 43 Inlrullucd Imm Roddy and Ruddy 1993 Release Rates of Organic Fertilizers TABLE IG Release of Mineral Nitrogen from Various Organic Materials Applied to Soils as Percent of the Organic Nitrogen Originally Present liar example if 10 Mg ofponlty floor litter initially contains 300 kg N in organic forms 50 or 150 kg oN would be mineralized in year 1 Another 15 015 X 300 or 45 kg ofN would be released in the year 2 Olgalie nin ogen source Y al39 1 YC WZ Year 3 Year 4 l oullry floor litter 50 15 8 3 Dairy manure fresh solid 25 18 9 4 Swine manure lagoon liquid 45 12 6 2 139eedlot cattle manure 35 15 6 2 jomposted feedlot manure 20 8 4 1 Lime stabilized aerobically digested sewage sludge 40 12 5 2 Anaerobically digested sewage sludge 20 8 4 1 Composted sewage sludge 10 5 3 Z Activated unstabilized sewage sludge 45 15 4 2 Residual Nutrients amp Recommendations Residual nutrients from previous fertilizers Organic and inorganic N fixed by green manures or previous crop eg alfalfa Recommended fertilizer rates For expected yield of your crop For your area So how much is in the bag Fertilizers usually show 3 numbers eg 251010 First number N Second number P205 Third number K20 Calculations You have a 50 lb bag of KNO3 13044 and the recommended application rate is 36 lb Kacre How many bags will you per acre K39gmol N14gmo O16gmol 1 Find percent K20 44 2 Find weight K20 044 x 50 lbs 22bs 3 Find molecular weight K20 39 x 2 16 94gmol 4 Find percent K 39 x 2 78 7894 83 5 Find weight K 083 x 22 lbs 183 lbs K 6 Find bags 36183 about 2 bags