Title: DETERMINATION OF THE MOST SUITABLE SOWING DATE FOR RAPESEED CULTIVARS IN BUSHEHER PROVINCE
Abstract: To determine the most suitable sowing date for rapeseed cultivars this study was carried out in Busheshr Agriculture Research Center, Borazjan in 1997-1998 cropping season using a strip plot design with four replications. Rapeseed cultivars were: Global, Regent, Tower, Pf7045/91, Pf5045/88 and Maluka which were sown on four different dates with fifteen days interval (oct.20, nov.5, No. 20 and dec.5). Each plot was four row (3m), with 50cm row distances. Results showed that mean seed yield was highest (1509 kg/ha) when sown on oct.20. Interaction between sowing date and cultivars indicated that Pf7045/91 and Pf5045/88 sown on oct. 20, produced the highest mean seed yield of 2010 and 1840 kg/ha, respectively. Results of correlation studies indicated that grain yield had a positive and significant relation with oil yield, plant height and height of first pod. The heighst correlation was determined between seed yield and oil yield(r=0.99) and there was no significant correlation between the other traits. Abstract Sainfoin (Onobrychis sativa) is a soft forage plant with high protein content. It has some characteristics such as: resistance to unfavorable environmental conditions as:low soil fertility, very low temperature, resistance to drought in dryland farming with acceptable yield, resistance to overgrazing in rangelands, and suitable for direct grazing. To study the effect of various levels of nitrogen and phosphorous on forage yield of Sainfoin a field experiment was conducted, using a randomized complete block design with four replications and two factors, nitrogen fertilizer with three levels (N0, N60 and N120 kg/ha) and phosphorous fertilizer with four levels (P0, P30, P60 and P90 kg/ha). The main purpose of this study was to introduce scientific strategies to safe and less harmful use of chemical fertilizers to produce acceptable yield with sustainable approach to environment conservation. In this research, dry matter yield (kg/ha), wet weight yield (kg/ha) and shoot height (cm) were measured. Except shoot height and dry matter of roots, other characteristics were significantly affected (P ≤ 1%) by various levels of nitrogen and phosphorous fertilizers. The interaction between these two types of fertilizers was not significant. Results of this study implies that N60P60 was the best fertilizer recommendation considering the economical aspects and acceptable forage yield.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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