Abstract
A field experiment was conducted during Kharif, 2011-2012 and 2012-2013 at GKVK, Bengaluru, Karnataka to study the effect of integrated package of agrotechniques on growth and yield of aerobic rice. The predominant weed flora observed in the experimental field were, Eleusine indica, Digitaria marginata L., Dactyloctenium aegyptium L., Alternanthera sessilis, Mollugo distica L., Celosia argentia and Borreria hispida. Treatments receiving integrated weed management practices recorded significantly lower weed population and weed dry weight as compared to pre-emergence application of pyrazosulfuron ethyl alone. Application of RDF + FYM + Biofertilizers + FeSO4 +IWM practices (T8) recorded significantly higher growth, yield parameters and yield as compared to RDF + FYM + IWM practices and was being on par with RDF + FYM + Biofertilizers + IWM practices (T5).
Highlights
Water shortage is becoming severe in many ricegrowing areas in the world
Weeds are the greatest constraint in aerobic rice system, resulting in 30 - 98 per cent yield losses [2]
The predominant weed flora observed in the experimental field during kharif, 2011 and 2012 in association with the aerobic rice were narrow leaved weeds such as Eleusine indica, Digitaria marginata L., Dactyloctenium aegyptium L., Rhynchelytrum repens and broad leaved weeds like Alternanthera sessilis, Euphorbia geniculata L., Mollugo distica L., Celosia argentia, Emilia sonchifolia, Phyllanthus niruri, Borreria hispida and Spilanthes acmella [6,7]
Summary
Water shortage is becoming severe in many ricegrowing areas in the world. The introduction of aerobic rice means growing of high yielding rice in non-puddled and non-flooded aerobic soil with the support of external inputs like supplementary irrigation, manures and fertilizers, through which 30 - 50 per cent of water can be saved [1]. The absence of standing water makes aerobic rice more weed infested resulting in competition for resources with crop plants. In this contrast, usage of herbicides is proven to be more effective but intensive herbicide use can cause environmental contamination and the development of herbicide resistance by weeds [3]. The research information on integration of all available technologies in aerobic rice production is lacking. Keeping these points in view, an experiment entitled growth, yield and economics of aerobic rice as influenced by integrated package of agrotechniques was conducted
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