A two year (2010 and 2011) experiment was conducted on four mungbean varieties (V 1 -Pant Mung-5, V 2 -Bireswar, V 3 -RMG-62 and V 4 -Sukumar) sown on three different dates (D 1 -15 th February, D 2 -1 st March, D 3 -15 th March) in a split plot design (Main plotdates of sowing and Sub plot-variety) in the Student's Instructional Farm, BCKV, West Bengal. The reproductive components such as bud, flower and pod numbers plant -1 and pod:flower ratio were recorded from 25 to 46 days after emergence (DAE). The relationship between the mean air temperature and different reproductive components were computed. Bud number per plant was maximum on 34 DAE when sown on D 2 , while it was maximum on 37 DAE under D 1 and D 3 sown crops. Highest number of flower per plant was observed on 37 DAE irrespective of dates of sowing, whereas, the maximum number of pods per plant was observed on 46 DAE. Among the dates of sowing, the D 2 sown crop recorded significantly higher number of bud, flower and pod. Among the four varieties, Pant Mung-5 recorded the maximum number of bud, flower and pod per plant. Pod: flower ratio under 1 st March sowing was highest under 37 to 40 DAE. With the advancement of age, the D 3 sown crop recorded highest pod:flower ratio. Number of buds per plant was found to be significantly related to the mean air temperature in 2010 under different varieties, but in 2011, it was insignificant. However, the number of flower and pod per plant were significantly related to the mean air temperature in both the year. Increased temperature increased the number of flower plant -1 but the reverse was true in case of pod. Increased temperature under delayed sowing significantly reduced the pod number plant -1 . A temperature range of 27 to 32°C was found to be congenial for the reproductive development in mungbean.

A two year experiment was conducted at the BCKV with four mungbean varieties (Pant Mung-5, Bireswar, RMG-62 and Sukumar) sown under three dates (15 th February, 1 st and 15 th March) in a split plot design where dates of sowing and varieties were allotted to main and sub plot treatments respectively with three replications. PAR was recorded with the help of line quantum sensor. Dry matter accumulation, yield attributes and yield were measured. Canonical correlation and correspondence analysis showed that absorbed PAR during 32 to 46 days after emergence (DAE) increased dry matter, pod and seed yield. PAR use efficiency (PARUE) of mungbean ranged from 0.75 to 0.88 g MJ -1 for seed yield. PARUE for dry matter production was maximum during 39 to 46 DAE. According to PARUE and heat use efficiency, Pant Mung-5 should be sown within 1 st March in this zone. Growing degree day requirement gradually increased with delayed sowing.

Background: A field experiment was conducted at the Experimental Research Farm of School and Agricultural Sciences and Rural Development (SASRD), Nagaland University, during the Kharif season of 2017 and 2018 to study the effect of sulphur and zinc fertilization for biofortification in soybean (Glycine max L. Merrill) under Nagaland condition. Methods: The experiment was laid out in a Factorial Randomized Block Design (RBD) with 15 treatments combinations viz sulphur (0 kg ha-1, 20 kg ha-1 and 40 kg ha-1), zinc (0 kg ha-1, 5 kg ha-1, 10 kg ha-1, 15 kg ha-1, and 20 kg ha-1) replicated thrice. Result: The results obtained showed that the plant growth and yield attributes were significantly influenced by the treatment combination of S20Zn20. The application of 20 kg S ha-1 showed higher plant height, number of leaves and branches per plant, shoot dry weight, leaf area index (LAI), crop growth rate (CGR), number of nodules and was found to be quite comparable with the treatment of 40 kg S ha-1. The zinc fertilization of 20 kg Zn ha-1 showed greater response by the plant and showed increased plant height, number of leaves and branches per plant, shoot dry weight, leaf area index (LAI) and number of nodules at par with 15 kg Zn ha-1. A higher number of pods (40.48 and 40.89), seed yield of (1.07 t ha-1 and 1.10 t ha-1) and stover yield (1.97 t ha-1 and 2.02 t ha-1) were observed in 20 kg S ha-1 and 20 kg Zn ha-1 fertilization respectively as compared to the other levels of treatments. However, the length of pods, number of seeds per pod, test weight and harvest index did not differ significantly by the treatments.

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