HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Robinson, A. P. Articles by Santini, J. B. Search for Related Content PubMed Articles by Robinson, A. P. Articles by Santini, J. B. Agricola Articles by Robinson, A. P. Articles by Santini, J. B. Related Collections Soybean Crop Growth and Development

SOYBEAN

Analysis of High Yielding, Early-Planted Soybean in Indiana

^a Dep. of Agronomy, Purdue Univ., 915 West State St., West Lafayette, IN 47907-2054
^b Dep. of Agronomy, 1575 Linden Drive, Univ. of Wisconsin, Madison, WI 53706

^* Corresponding author (arobinson{at}purdue.edu).

A trend toward early planting of soybean [Glycine max (L.) Merr.] in Indiana results in higher yield, but the limit to which a positive response to early planting occurs has not been evaluated. Our objective was to determine how early planting affects yield components and seed composition of indeterminate soybean planted in late March through early June in Indiana. Three cultivars (Pioneer brand 92M61, Becks brand 321NRR, and Becks brand 367NRR) were sown at six planting dates (late March through early June) in West Lafayette, IN, in 2006 and 2007. Across cultivars, yield in 2006 ranged between 4.24 to 4.43 Mg ha^–1 at the planting dates from late March to mid-May, and decreased to 3.36 and 3.56 Mg ha^–1 at later planting dates. In 2007, yield ranged from 4.21 to 4.44 Mg ha^–1 for the 10 April, 30 April, and 9 May planting dates. Yield was reduced at the late March and early June plantings and ranged from 3.85 to 3.99 Mg ha^–1. Path analysis revealed that pods m^–2 had the greatest impact on yield, but seed mass was also an important constituent. Mean oil concentration decreased approximately 12 g kg^–1 as planting was delayed in both years. In 2006, average seed protein concentration varied by planting date. In 2007, mean protein concentration increased 14 g kg^–1 as planting was delayed. Delaying planting until late May or early June altered seed composition slightly, but significantly reduced yield. Planting in April or early May is an effective management strategy to increase soybean yield in Indiana.

All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher.

Received for publication July 10, 2008.