Herron, George M.

Schapaugh, William T., Jr.

Witt, Merle D.

Kansas State University

Kansas Agricultural Experiment Station Research Reports Volume 0 Issue 12 Keeping up with Research Article 127 1996 Soybeans Tolerant of Iron Chlorosis Merle D. Witt George M. Herron William T. Schapaugh Jr. This report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 1996 Kansas State University Agricultural Experiment Station and Cooperative Extension Service. Contents of this publication may be freely reproduced for educational purposes. All other rights reserved. Brand names appearing in this publication are for product identification purposes only. No endorsement is intended, nor is criticism implied of similar products not mentioned. K-State Research and Extension is an equal opportunity provider and employer. Follow this and additional works at: https://newprairiepress.org/kaesrr Recommended Citation Witt, Merle D.; Herron, George M.; and Schapaugh, William T. Jr. (1996) "Soybeans Tolerant of Iron Chlorosis," Kansas Agricultural Experiment Station Research Reports: Vol. 0: Iss. 12. https://doi.org/10.4148/2378-5977.7364 Soybeans Tolerant of Iron Chlorosis Keywords Keeping up with research; SRL 112 (June 1996); Kansas Agricultural Experiment Station contribution; no. 96-446-S; Soybeans; Iron chlorosis; Tolerance Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 License. This research report is available in Kansas Agricultural Experiment Station Research Reports: https://newprairiepress.org/kaesrr/vol0/iss12/127 Soybeans Tolerant of Iron Chlorosis M.D. Witt, Research Agronomist G.M. Herron, Head W.T. Schapaugh, Research Soybean Geneticist Chlorotic soybeans with reduced yields due to a shortage of available iron are an increasing problem in __ Kansas. As the soybean acreage expands in the central (_ ;and western portions of the state, the iron deficient ar-eas that often are associated with highly calcareous soils are becoming more apparent. In severe cases of iron deficiency, other crop choices should be considered rather than soybeans. Where soybeans are grown, however, partial solutions to this expanding crop prob-lem are possible. Yield losses due to iron deficiency often can be minimized in soybeans by: (1) Growing varieties with genetic tolerance to iron chlorosis. (2) Making field applications of livestock m.anure. (3) Making foliar applications of iron-containing materials. Among these three alternatives, using varieties tol-erant of iron deficient soils is the most generally desir-able. Livestock manure applications to a field are often effective, but drawbacks include accessibility to ma-nure , high transportation costs, and the frequent pres-ence of weed seed. Foliar iron applications often are not very effective with soybeans and the materials also tend to be expensive, difficult to maintain in suspension, and abrasive to application equipment. This publication from Kansas State University Agricultural Experiment Station and Cooperative Extension Service has been archived. Current information: http://www.ksre.ksu.edu.Procedure Approximately 80 soybean varieties plus 200 ex-perimental lines have been studied during 1981-84 in field plots at the Garden City Experiment Station and nearby counties for their response to soils with limited available iron. Iron chlorosis ratings for entries were taken so that advancements can be made in the devel-opment of future Kansas variety releases having greater tolerance of iron deficiencies. Plant response was estimated visually for each plot with ratings to the nearest 0.5 score between 1 (excel-lent) and 5 (poor), depending upon the degree of plant yellowing. Ratings then were averaged from three plots for each entry. Sites used for testing were selected by their tenden-cies for uniform moderate iron deficiency symptoms as observed with previous soybean or sorghum cropping. Soil types varied but soils of the six sites contained ap-proximately 3 to 5 ppm iron (DPTA test). Results The reactions of some public and private varieties are given in Table 1. Results shown include primarily data from locations in Finney County and Meade County during 1982. These data cover released vari~ eties available to the public and of interest to producers! The first eight varieties listed in Table 1 rank signifi-cantly better than other entries in tolerance to limited available iron. The very poorest tolerance was shown by the variety Harcor. Conclusions Although there are no soybean varieties available with complete tolerance to iron chlorosis, some show moderate levels of tolerance. Moderate tolerance allows improved soybean production in all but the most severe problem areas. Thus, variety selection is often the most practical solution to chlorosis caused by iron deficiency. / This publication from Kansas State University Agricultural Experiment Station and Cooperative Extension Service has been archived. Current information: http://www.ksre.ksu.edu.-·- ······ ······· ·· ··········-----------.... .. -~~--.,-....... ............. ........ , .. . .............. .................. _____________ ............................. , ....... , ..... ,.,, .. , .. , .... ,, .. ,.,,., ........ , .. ,.,_, ... , ......... -... - . -------- ~-=---~·---------------- ~~-· . ···- ·--·----...  -·~·--.. . -.. -... --.. -Table 1. Soybean uariety evaluation for iron chlorosis tolerance . Iron Chlorosis Rating' 1982 Finney 1982 Meade Brand Entry County County Auerage Douglas 2.0 1.9 2.0 Calland 2.0 2.3 2.2 Dekalb CX350 2.0 (2 .6) .. 2.3 Ring Around Mitchell450 2.0 2.7 2.4 DeSoto 2.0 2.8 2.4 Sparks (2.5) •• 2.5 2.5 Migro HP4800 2.3 2.7 2.5 As grow A3659 2.3 2.6 2.5 Amsoy 71 2.3 3.2 2.8 Wilson 3130 3.0 3.0 3.0 Dekalb CX321 3.0 3.0 3.0 Dekalb CX380 2.7 3.3 3.0 Wilson 3340 3.0 2.9 3.0 Wilson 3860 2.7 3.3 3.0 Crawford 2.7 3.2 3.0 Williams 3.0 3.2 3.1 Wilson 3550 3.0 3.2 3.1 c -- Union 2.7 3.7 3.2 ~--'\ Williams82 3.0 3.4 3.2 ! Asgrow A3860 2.7 3.8 3.3 Pella 3.0 3.8 3.4 Cumberland 3.0 3.7 3.4 Migro HP3700 3.0 4.0 3.5 Williams79 3.3 3.8 3.5 Nebsoy 3.7 3.4 3.6 Sprite 3.3 4.2 3.8 Hare or 4.0 4.7 4.4 Test Averages 2.8 3.2 3.0 L.S.D. (.05) 0.5 0.8 0.5 • Based on 1 = excellent to 5 = poor. • 'Ratings from 1983 tests. ! \ This publication from Kansas State University Agricultural Experiment Station and Cooperative Extension Service has been archived. Current information: http://www.ksre.ksu.edu.( Contribution 85-81-S, Garden City Branch Station and Depart-ment of Agronomy. Agricultural Experiment Station, Manhattan 66506 II_F§.Y Keeping Up With Research 81 December 1984 Publications and public meetings by the Kansas ~ Agricultural Experiment Station are available and S'rA!:I'E open to the public regardless of race, color, na-UNlVER.SITY tlonal origin, sex, or handicap. 12-84- 3M ( This publication from Kansas State University Agricultural Experiment Station and Cooperative Extension Service has been archived. Current information: http://www.ksre.ksu.edu.

Soybeans Tolerant of Iron Chlorosis (1984)

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Soybeans Tolerant of Iron Chlorosis

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