International Journal of Chemical Studies
Vol. 6, Issue 2 (2018)
Integrated weed management studies in onion (Allium cepa L.) During Rabi and Kharif season
Author(s): Priynka Kumari Jat, Kavita Choudhary and Dr. SK Khandelwal
Abstract: Onion is one of the most important commercial vegetable crops grown all over the world. In India onion occupies about 1.23 million hectare area having 19.40 million metric tonnes of production and average productivity of 16.10 metric tonnes ha-1 (Anonymous 2013-14). Onion has culinary, dietary and medicinal importance in daily life of Indian people and due to its export trade, it is also a major vegetable crop to gain foreign currency. Onion crop is slow growing, shallow rooted, narrow, upright leaves and non branching habit. Due to this type of growing habit, onion crop cannot compete well with weeds. In addition to this, frequent irrigation water and fertilizer application allows for successive flushes of weeds in onion. The reduction in crop yield has direct correlation with weed competition. Onion exhibits greater susceptibility to weed competition as compared to other crops due to its inherent characteristics such as their slow growth, small stature, shallow roots and lack of dense foliage. The effective weed control involves identification of weed flora, method of weed control and judicious combination of effective weed control methods. Hand weeding in onion is a common practice in India, but it is a tedious, expensive and time consuming task due to closer spacing and shallow root system. Non-availability of labourers during critical period of crop makes hand weeding difficult leading to heavy yield losses. Spraying of pre-emergence herbicides keeps the crop in weed free conditions during the early stages. At later stage, second flush of weeds will affect the bulb formation. Hand weeding helps to keep the weed population below economic threshold level throughout the crop growth period. Pre-emergence combined with hand weeding may be costly because of the reduced labour availability and higher labour cost. After bulb formation manual or mechanical methods of weed control will damage the bulb. Application of early post emergence may be helpful to reduce damage to the bulb, weed competition and cost of weeding. Hence a brief review was presented to find out the effect of different weed management method in onion.
Pages: 2114-2119 | 275 Views 11 Downloads
How to cite this article:
Priynka Kumari Jat, Kavita Choudhary, Dr. SK Khandelwal. Integrated weed management studies in onion (Allium cepa L.) During Rabi and Kharif season. Int J Chem Stud 2018;6(2):2114-2119.