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

This Article Abstract 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 Stevens, G. Articles by Dunn, D. Search for Related Content PubMed Articles by Stevens, G. Articles by Dunn, D. Agricola Articles by Stevens, G. Articles by Dunn, D. Related Collections Rice Nitrogen Nutrient Management

Predicting Rice Yield Response to Midseason Nitrogen with Plant Area Measurements

^a Univ. of Missouri-Delta Research Center, P.O. Box 160, Portageville, MO 63873
^b USDA Cropping Systems and Water Quality Research Unit, Portageville, MO 63873

View larger version (8K): [in this window] [in a new window]   Fig. 1. Illustration of rice leaves blocking the overhead view of inch numbers on a yardstick floating in floodwater parallel and halfway between two rice 19-cm spaced drill rows. In this example, 2, 7, 11, 12, 14, 15, 20, 25, 28, 31, and 35 would not be counted as showing.

View larger version (54K): [in this window] [in a new window]   Fig. 2. Example images (left to right- low preflood nitrogen [PFN] to high PFN,) collected at R1 growth stage with a digital camera from 80 by 115 cm areas in rice plots. Values in the lower right corner of photos were the proportion of green pixels in images.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Relationship between visible numbers showing on yardstick and percent green pixels in digital images measured at R1 growth stage before midseason N was applied in 2005 and 2006 on Francis and Cheniere cultivars.

View larger version (17K): [in this window] [in a new window]   Fig. 4. Rice yield response to midseason N applications relative to percentage of green pixels in digital images recorded at R1 stage from Francis and Cheniere cultivars in 2005 and 2006 on Sharkey clay and 2006 on Dewitt silt loam soil.

View larger version (20K): [in this window] [in a new window]   Fig. 5. Rice yield response to midseason N applications relative to visual number of numbers showing on yardstick at R1 growth stage from Francis and Cheniere cultivars in 2005 and 2006 on Sharkey clay and 2006 on Dewitt silt loam soil.