Horses and Cows Prefer Weed-Free Alfalfa

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Alfalfa is the perfect food for horses and cows. High in protein, minerals and nutrients, alfalfa is essential for a balanced diet. When alfalfa is harvested mechanically, any weeds in the field are also harvested and contaminate the alfalfa bales, which lowers the value of the alfalfa bale for animal feed. As a result, alfalfa growers, particularly in California, the number one alfalfa state, use herbicides to produce high-quality weed-free alfalfa bales.

“The selling price for clean high quality alfalfa remains as much an incentive today as ever. It is estimated that greater than 75% of acreage is treated for weeds on an annual basis. The market financially rewards weed free high quality forage with higher prices. In 2011, the price for high test >56 TDN weed free hay topped $280 per ton to the grower, as compared to lower quality non test hay with few weeds approximately $160 per ton. Extremely weedy or rain damage hay was priced even lower. Weed free fields remain an economic incentive for best prices and longer lasting stands. When weeds take over, it weakens alfalfa plants, increases incidence of diseases, insects, and lowers hay quality and a significant loss of income. Maintaining good weed control practices is necessary to sustain an economically viable and healthy producing crop of alfalfa for many years.”

Author: Canevari, M.
Affiliation: UCCE Advisor.
Title: Advances in weed management, is it getting better or worse?
Source: 2011 41st California Alfalfa Symposium. Proceedings available at: http://alfalfa.ucdavis.edu/+symposium/proceedings/2011/11-102.pdf

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Sustaining Water Resources in Asia Means Rice Growers Must Use Herbicides

Rice Fields

Rice Fields

Flooding rice fields prevents certain weed species from developing and rice fields in Asia are major users of water resources. However, a looming water shortage in Asia means that rice growers will have to cut back on water use. Herbicides are being tested as a replacement for flooding for weed control in rice fields.

Currently, sustainability of water resources is of major concern, and declining water availability threatens the sustainability of traditional flood-irrigated rice ecosystems. In Asia, it is predicted that 17 million ha of irrigated rice areas may have “physical water scarcity” and 22 million ha areas may be subject to “economic water scarcity” by 2025. It is, therefore, no longer feasible to flood rice fields for better crop establishment and weed control.

“Aerobic rice, growing rice in non-saturated and non-puddled aerobic soil, is a promising water-wise technique of rice cultivation under the context of ever-mounting water scarcity. But weed menace continues to be a severe problem in aerobic rice systems resulting in up to 90% reduction in grain yield. When direct seeded, rice seeds germinate simultaneously with weed seeds without any “head start” over germinating weed seeds, and the initial flush of weeds is not suppressed by flooding. …Therefore, effective weed management in aerobic rice has become a serious challenge for researchers and farmers.

Eight commercial herbicide products were applied singly or as tank-mix or in sequence to evaluate their efficacy, rice selectivity and cost-effectiveness in aerobic rice. …Most of the herbicide treatments provided excellent weed control, and produced much higher net benefit than weedy or weed-free check. …Among the herbicide treatments, sequential application of Cyhalofop-butyl + Bensulfuron at early growth stage followed by Bentazon/MCPA at mid growth stage provided the highest weed control efficiency, productivity and net benefit. …Since manual weeding was not economic, herbicide rotation using the above chemicals may be recommended for effective weed management in aerobic rice.

In the present study, cost of different herbicide treatments ranged from RM 167 to RM 469 ha-1 depending upon the price and rate of application, while manual weed control required a high investment of RM 2500 ha-1 for season-long weed-free checks.

In our study, the net benefit of the herbicidal weed control was two to three times higher than that obtained from manual weed control. Hence, manual weeding is less remunerative than herbicidal control, and keeping aerobic rice field weed-free manually throughout the season is a losing concern, confirmed by many others.”

Authors: Anwar, P., et al.
Affiliation: Institute of Tropical Agriculture, Universiti Putra Malaysia
Title: Efficacy, phytotoxicity and economics of different herbicides in aerobic rice.
Source: Acta Agriculturae Scandinavica Section B – Soil and Plant Science. 2012. 62:604-615.

Australian Grains Council Extols Importance of Pesticides

Australia’s Grains Research & Development Corporation (GRDC) is one of the world’s leading grains research organizations, responsible for overseeing R&D that deliver improvements in production, sustainability and profitability across the Australian grains industry. Recently, draft legislation concerning regulation of agricultural and veterinary (Agvet) chemicals in Australia was circulated for comment. The Grains Council weighed in with their view on how important these chemicals are…

“The Australian grains industry is heavily dependent on the efficient use of pesticides in maintaining productivity and profitability.”

“Access to a wide range of effective, safe Agvet chemicals is crucial to maintaining the productivity, sustainability and international competitiveness of many farming systems. Australia’s biosecurity depends on access to a diversity of pesticides and a responsive regulatory system.”

Author: J. Harvey
Affiliation: Grains Research & Development Corporation
Source: Comments in relation to GRDC research delivery under the draft Agricultural and Veterinary Chemicals Legislation Amendment (Agvet) Bill. February 28, 2012