Planting date effects on the incidence of mungbean yellow mosaic virus (MYMV) and cultivars performance under rainfed environments

摘要

Optimum planting date is an important factor for achieving improved mungbean production in different agro-ecological zones of the world. To determine the effects of different planting dates on the performance of mungbean cultivars under rainfed conditions, a split plot experiment consisting of eight planting dates (May 26 th , June 2 nd , 9 th , 16 th , 23 rd , 30 th and July 7 th , 14 th ) and two cultivars (AZRI.M-2006 & NM-2006) was conducted during May-October 2011 and 2012 at Gram Breeding Research Substation, Kallurkot, Bhakkar, Pakistan. Results revealed a productivity difference of 1766 kg/ha between the best (June 2 nd ) and worst (July 14 th ) planting date. Maximum plant height, pods per plant, pod length, seeds per pod, 1000 grain weight, seed yield and fewer incidence of MYMV belonged to June 2 nd planting followed by May 26 th while beyond this, there was a gradual decrease in yield and relevant components and increase in MYMV incidence, being the highest on July 14 th planted crop. Highest mean seed yield (1990 kg/ha) and lowest MYMV incidence were recorded from June 2 nd sown experiments while lowest mean seed yield (224 kg/ha) and highest MYMV incidence were observed from July 14 th sown trials. Mungbean sowing experiments conducted on June 2 nd perhaps completed physiological phase’s i.e. vegetative and reproductive at proper time which accounted for its higher yield than later or earlier sown trials. Lesser incidence of MYMV and shorter plant height of AZRI-M.2006 with greater pods per plant, pod length, 1000 grain weight contributed to its more seed yield than NM-2006. Further, correlation studies revealed positive and significant relationship of seed yield with plant height, pods per plant, pod length and seeds per pod while negative and significant with MYMV.