Bio-efficacy of post emergence herbicides in boro rice nursery as well as main field and their residual effects on non-target microorganisms

Abstract

Field experiments were conducted at research farm of Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal, India (22°97' N latitude and 88°44' E longitude, 9.75 m above mean sea level) under natural weed infestations in boro season rice (nursery bed as well as main field) during 2017-18 and 2018-19 to evaluate the herbicidal effects on weed floras, yield, non-target soil organisms to optimize the herbicide use for sustainable rice-production. Seven weed control treatments including three doses of bispyribac-sodium 10% SC (150,200, and 250 ml ha-1), two doses of fenoxaprop-p-ethyl 9.3% EC (500 and 625 ml ha-1), one weed free and weedy check were laid out in a randomized complete block design, replicated thrice. Among the tested herbicides, bispyribac-sodium with its highest dose (250 ml ha-1) resulted in maximum weed control efficiency, treatment efficiency index and crop resistance index irrespective of weed species and dates of observation in both nursery as well as main field. Similar treatment also revealed maximum grain yield (5.20 t ha-1), which was 38.38% higher than control, closely followed by Fenoxaprop-p-ethyl (625 ml ha-1) had high efficacy against grasses, sedge and broadleaf weed flora. Maximum net return (Rs. 48765 ha-1) and benefit cost ratio (1.72) were obtained from the treatment which received bispyribac-sodium @ 250 ml ha-1. Based on overall performance, the bispyribac-sodium (250 ml ha-1) may be considered as the best herbicide treatment for weed management in transplanted rice as well as nursery bed.

Raising Climate-Resilient Embolden Rice (Oryza sativa L.) Seedlings during the Cool Season through Various Types of Nursery Bed Management

“…A uniform dose of N:P 2 O 5 :K 2 O at 2.5:5:2:2.5 per 0.1 ha was applied at the time of land preparation.Pre-germinated seeds were sown carefully in seedbeds with a seed rate of 50 kg per 1000 m 2 area for 1 ha main field. All the recommended packages and practices were followed for conventional nursery bed [8].…”

“…However, the present productivity of rice in eastern India is quite low and uncertain because of its dependency on monsoon, climatic abnormalities, and poor management practices [6,7]. Seedbed management is one of the crucial aspectsof rice production [8], most particularly in the winter season as temperature plays a pivotal role in the development of seedlings at the juvenile stage by influencing numerous physiological changesinthe plant body [9].…”

Effect of rice-establishment methods and nutrient management on productivity, profitability and soil health under rice (Oryza sativa)–groundnut (Arachis hypogaea) cropping system

“…India occupies the world's largest area (44.5 million hectares) under rice and is the second highest producer (121.26 million tonnes), contributing 22% of global rice production. But its low productivity (2.75 t/ha) worries more than 60% of Indian population, who depends on rice for their food and nutritional security (Kundu et al, 2020). Inclusion of oilseeds and legumes changes the economics of the rice-based cropping systems, as these crops are receiving more attention for their limited production and higher prices (Deep et al, 2018).…”