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

This Article Full Text Full Text (PDF) 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 Carley, D. S. Articles by Burton, M. G. Search for Related Content PubMed Articles by Carley, D. S. Articles by Burton, M. G. Agricola Articles by Carley, D. S. Articles by Burton, M. G. Related Collections Crop Growth and Development

PEANUT

Peanut Response to Planting Date and Potential of Canopy Reflectance as an Indicator of Pod Maturation

^a Dep. of Crop Science, Box 7620, North Carolina State Univ., Raleigh, NC 27695
^b Syngenta Crop Protection, P.O. Box 18300, Greensboro, NC 27419
^c Dep. of Plant Pathology, Box 7404, North Carolina State Univ., Raleigh, NC 27695
^d Dep. of Entomology, Box 7613, North Carolina State Univ., Raleigh, NC 27695

^* Corresponding author (david_jordan{at}ncsu.edu).

Determining when to dig peanut (Arachis hypogea L.) is complicated because of its indeterminate growth habit. Pod mesocarp color is often used an indicator of pod maturation. However, this process is time consuming and is usually based on a relatively small subsample of pods from peanut fields. Research was conducted during 2003–2005 to determine if reflectance of the peanut canopy, using multispectral imaging (350–2500 nm), could be used as an indicator of pod maturation. The cultivars VA 98R and NC-V 11 were planted beginning in early May through early June during each year with reflectance and the percentage of pods at optimum maturity (percentage of pods with brown or black mesocarp color) determined in mid-September. The highest yield observed for VA 98R across the 3 yr of the experiment was noted when peanut was planted in mid-May rather than early or late May or when planted in early June when peanut was dug based on optimum pod maturity using pod mesocarp color. Pod yield for the cultivar NC-V 11 did not differ when comparing planting dates. For cultivar VA 98R, Pearson's correlations were significant for all bandwidth categories except the normalized difference vegetation index (NDVI) when reflectance was compared with percentage of mature pods. Reflectance for NC-V 11 was not significant for any of the correlations even though significant differences in the percentage of mature pods were noted in mid September when comparing planting dates. These data suggest that canopy reflectance could potentially aid in predicting pod maturation, but more research is needed to determine feasibility of this approach.

Abbreviations: DAE, number of days between peanut emergence and digging • HUA, heat unit accumulations • MIR, mid-infrared • NIR, near-infrared • NDVI, normalized difference vegetation index • UMIR, upper mid-infrared • %ELK, percentage of extra large kernels • %FP, percentage of fancy pods • %MP, mature pods • %TSMK, percentage of total sound mature kernels

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 December 11, 2006.