Rice plays a pivotal role in agrarian economy of the most of the Asian and South east Asian nations particularly India. Transplanted rice crop suffers much from biotic production constraints among which weed competition is the important one. The reduction in paddy yield ranges from 9-51 per cent due to infestation of wide range of weed species viz. grasses, sedges and broadleaved weeds. The severity of yield loss is aggravated further when weed infestation coincides with critical period of rice growth depriving it from moisture, nutrients, sunlight and acting as alternate host to some pests and diseases. The cost of weed management in transplanted rice is higher than other operations due to exorbitant wage rate combining with low efficiency moreover due to scarcity of labour during peak period, weeding operation has become a cumbersome, time consuming and costly affair for rice farmers. Therefore, herbicide technology offers a mutual inclusive method of selective and economical control of weeds right from the beginning and forms a major component of integrated weed management of rice farming for reaping bumper yield.
Aims: A field experiment entitled “Growth and development of groundnut (Arachis hypogaea L.) as influenced by different levels and timing of phosphogypsum nutrition” was planned to ascertain the role of phosphogypsum an industrial by product in promoting growth of groundnut. Study Design: Experiment was carried out at Agronomy field unit, Zonal Agricultural Research Station, University of Agricultural Sciences, GKVK, Bangalore, during kharif 2019. Experiment was planned with eleven treatments of which eight received sulphur through phosphogypsum at different levels (50, 75, 100 and 125 kg S eq ha-1) as basal and split (30 DAS) and one through gypsum (500 kg ha-1) as basal. Whereas, other two treatments with NPK and NK alone are included for comparison. Design of the experiment is RCBD with eleven treatments replicated thrice. Results: Among different treatments, application of phosphogypsum 125 kg S eq ha-1 in split recorded highest growth parameters like plant height (42.49 cm), leaf area (1137 cm2 plant-1), dry matter per plant (29.30 g) and number of branches plant‑1 (8.62). Whereas, application of phosphogypsum 100 kg S eq ha‑1 in split found on par with 125 kg with respect to all growth parameters. While lowest values of all the parameters were noticed in treatment receiving N and K fertilizer alone.
Background: Groundnut is one of the most important oilseed crops of India. Improving productivity of groundnut to meet the domestic vegetable oil demand through balanced fertilization is the prime challenge lying before the agronomists in the country. With the aim of evaluating phosphogypsum as a source of sulphur nutrition in groundnut, a field experiment entitled “Response of groundnut (Arachis hypogaea L.) to different levels and time of phosphogypsum nutrition” was conducted at Agronomy field unit, University of Agricultural Sciences Bangalore, during kharif-2019. Methods: Experiment was laid out in randomised complete block design (RCBD) with eleven treatments, of which eight have different combinations of phosphogypsum applied as basal and in split (30 DAS) and one with gypsum as basal alone. Whereas, the remaining two treatments, without any additional source of sulphur are included for comparison. Result: Among eleven treatments, application of phosphogypsum @ 125 kg S eq ha-1 in split recorded highest yield attributes, pod yield (2063 kg ha-1), kernel yield (1418 kg ha-1) and sulphur uptake (11.33 kg ha-1). Which were on par with 100 kg S eq ha-1 in split (2014, 1380 and 10.39 kg ha-1, respectively). All other treatments recorded lower values with lowest in treatments without any additional sulphur source.
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