Paper Information

Journal:   NEW FINDINGS IN AGRICULTURE   SPRING 2008 , Volume 2 , Number 3 (7); Page(s) 285 To 295.
 
Paper: 

EFFECT OF HARVESTING TIME ON YIELD AND GRAIN SHATTERING OF RAPESEED (BRASSICA NAPUS L. CV. OKAPI) IN ARAK CONDITIONS

 
 
Author(s):  MADANI H., NADERI BROUJERDI N., AGHAJANI H., CHANGIZI M., PAZOKI A.
 
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Abstract: 

Grain shattering of rapeseed in very sensitive by harvesting time. It increase dramatically by late harvest and early harvest couses to decreas index and yield performance. The goals of the present study were to identify the effect of harvesting date and time in day and night on rapeseed (cv. Okapi) yield, harvest index, some plant character, grain shattering rate and its percentage. The field experiment was conducted as split block design in complete randomized block with three replications in 2006-2007 at the Research Farms of Islamic Azad University, Arak, Iran. The harvesting date treatments consisted of three dates (10th and 26th of June, and 11th of July) and harvesting was taken four times per day and night (6.00am and 12.00pm, 6.00pm and 11.00pm). The results indicate that the grain harvested on 26th June was the most accurate date for rapeseed harvest time in Arak farm’s condition. Harvesting on 26th of June and at 6.00pm was the best term for beginning of harvesting. In this term the grain yield was the highest level up to 3600 kg/ha and the grain shattering percentage was the lowest one, by 14.0%. Any delay in harvesting from 26th June could result in the decrease of the yield and increase of the total grain loss. Harvesting at 11th of July was the critical date for the grain yield loss for two different reasons, first for increase of the shattering from 3.5% to 6.3% before harvesting and the second for grain shattering during the harvesting process in range from 14.8% to 16.3%.

 
Keyword(s): RAPESEED, YIELD, GRAIN SHATTERING, HARVESTING DATE, HARVESTING TIME
 
References: 
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