Weed flora of aerobic rice and their effect on growth, yield and nutrient uptake by rice Oryza sativa in the coastal region of Karaikal of Puducherry, India
Journal Title: Journal of Applied and Natural Science - Year 2018, Vol 10, Issue 1
Abstract
A field experiment was conducted at farm lands of Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal to know the weed floristic composition and their effect on growth, yield and nutrient uptake by aerobic rice (Oryza sativa). The results revealed that totally 29 species of weeds from 22 genera belonging to 17 families were noticed. Among them, four were grasses, six were sedges, and nineteen were broad leaved weeds. Of this 29 species, four were perennials, and the rest were annuals. During initial stages (30 DAS), sedges dominated (38.3%) whereas at later stages (60 DAS) broad leaved weeds dominated the aerobic rice fields (42.5%). Grasses were found to be comparatively less dominant at both the stages. Echinochloa colona Link. (28.1%) followed by E. cruss-galli (L.) Beauv. (6.1%) among the grasses; Cyperus difformis L. (19.8%) followed by C. iria L (9.9%) among the sedges and Ludwigia abyssinica (28.0%) among the broad leaved weeds, were the predominant weed species in aerobic rice cultivation. Weeds, when left unchecked, competed with rice for all resources like nutrients, space, light and soil moisture. The unweeded control recorded the maximum nutrient depletion by weeds (76.6, 6.4 and 106.8 Kg of N, P andK ha-1 ). Due to severe competition, weeds suppressed the growth of rice which resulted in lower growth and yield attributes leading to lower grain (333 kg ha-1 ) and straw yields (1903 kg ha-1 ).
Authors and Affiliations
M. Pavithra, R. Poonguzhalan
Keywords
Related Articles
- EP ID EP287241
- DOI 10.31018/jans.v10i1.1637
- Views 77
- Downloads 0
Resource management for apple scab and sanjose scale control of apple in Kashmir Valley of J&K State
The study on resource management for apple scab and sanjose scale of apple in Kashmir Valley of J&K State was conducted purposively in Sopore and Patten tehsils of Baramulla district covering 4 villages with a sample siz...
Population characteristics of Brueelia sp. on certain Indian Finches
Five kinds of finches were examined during 2004-06. Two kinds of finches were found infested with ischnoceran lice, Brueelia sp. (Prevalence-20.5%, mean intensity of infestation-4.7 and range of infestation, 1-23). The f...
Fish diversity of Haryana and its conservation status
The present study on fish biodiversity of Haryana state was carried out during 2011 to 2014. A total number of 59 fish species inhabits the freshwaters of this state. Maximum number of fish species belonged to the order...
Effect of growth regulators on micropropagation of Rauvolfia serpentina (L.) Benth.
An efficient protocol for micropropagation through in vitro culture of Rauvolfia serpentina was standardized. Out of different combination of phytohormone tested, MS media supplemented with 0.5 mg L-1Indole Acetic Acid +...
Metabolic changes during hibernating period in Indian common toad, Duttaphrynus melanostictus (Schneider, 1799)
The present investigation reports the effect of hibernation on different blood-plasma biochemical parameters viz. plasma protein, plasma glucose and blood urea, thyroid hormone and cholesterol in the Indian Common toad (...