4 results
Evaluation and Economics of a Machine-Vision Guided Cultivation Program in Broccoli and Lettuce
- Steven A. Fennimore, Laura Tourte, John S. Rachuy, Richard F. Smith, Christina George
-
- Journal:
- Weed Technology / Volume 24 / Issue 1 / March 2010
- Published online by Cambridge University Press:
- 20 January 2017, pp. 33-38
-
- Article
- Export citation
-
Machine-vision cultivator guidance systems are commercially available to growers, but little work has been done to determine if these guidance systems can improve integrated weed management systems in vegetable crops. Studies were conducted in 2005 and 2006 in broccoli and lettuce to evaluate band-applied DCPA or pronamide, respectively, and four noncultivated bands ranging from 5.1 to 12.7 cm. DCPA or pronamide were applied in bands centered on the seed line at 0, 7.6 or 12.7 cm wide. A commercial machine-vision system was used to guide a commercial cultivator. Generally, weed densities and hand-weeding times were less where the DCPA band in broccoli or the pronamide band in lettuce were 7.6 or 12.7 cm wide compared to no herbicide. Weed densities were lowest in both crops where the noncultivated band width was 5.1 cm compared to 12.7-cm noncultivated bands. For broccoli in both 2005 and 2006, net returns above production costs were generally higher in the 7.6- and 12.7-cm-wide DCPA bands compared with the no-herbicide band. In lettuce in both years, the no-pronamide treatment had higher net returns, when compared with the 7.6- and 12.7-cm pronamide bands. Lettuce yields and higher net returns in the no-pronamide treatment compared to the 7.6- and 12.7-cm pronamide bands may be due to slight yield reduction from pronamide. Results suggest that pronamide was not needed during the dry months of the year when weed management tools such as hand-weeding and cultivation work very well. However, in periods of rainy weather when cultivation and hand-weeding are not possible, then pronamide would likely provide the greatest economic benefit. Given the large impact of cultivation on vegetable weed management programs, the greatest potential benefit of machine-vision guided cultivators is if they facilitate more timely and effective cultivation.
Evaluation and Economics of a Rotating Cultivator in Bok Choy, Celery, Lettuce, and Radicchio
- Steven A. Fennimore, Richard F. Smith, Laura Tourte, Michelle LeStrange, John S. Rachuy
-
- Journal:
- Weed Technology / Volume 28 / Issue 1 / March 2014
- Published online by Cambridge University Press:
- 20 January 2017, pp. 176-188
-
- Article
- Export citation
-
A commercial intrarow rotating cultivator was tested for weed removal and impact on hand-weeding times in bok choy, celery, lettuce, and radicchio. The rotating cultivator was tested as an automated crop thinner and weeder in direct-seeded bok choy and lettuce as an alternative to hand-thinning and -weeding. The rotating cultivator utilized machine-vision guidance to align a rotating disk with the crop plant to be saved and to remove weeds and undesired crop plants. The rotating cultivator was compared to a standard interrow cultivator, which could not remove weeds from the plant line. Main plots were cultivator type, rotating, or standard, and subplots were herbicides: pronamide for lettuce or prometryn for celery. Weed densities, hand-weeding times, crop stand, and yields were monitored. Economic analysis was performed on a subset of the data. The intrarow rotating cultivator was generally more effective than the standard interrow cultivator for reducing weed densities and hand-weeding times. However, the rotating cultivator reduced seeded lettuce stands by 22 to 28% when compared to hand-thinning and standard cultivation, resulting in lower yields and net returns. In transplanted celery, lettuce, and radicchio, the rotating cultivator removed more weeds than the standard cultivator, and reduced stands by just 6 to 9% when compared to the standard cultivator. In transplanted lettuce, the rotating cultivator was more precise and did less damage to the crop. Because transplanted crops were larger than the weeds, they were more easily differentiated using this technology. Net returns were therefore similar between the two cultivators. What is needed for celery and leafy vegetables is an effective intrarow weed removal system that reduces or eliminates the need for hand-weeding yet does not reduce yields. The rotating cultivator was developed for transplanted crops, where it performs adequately, but it cannot be recommended in the seeded crops evaluated.
Horticultural auction markets: Linking small farms with consumer demand
- Laura Tourte, Mark Gaskell
-
- Journal:
- Renewable Agriculture and Food Systems / Volume 19 / Issue 3 / September 2004
- Published online by Cambridge University Press:
- 12 February 2007, pp. 129-134
-
- Article
- Export citation
-
Small farmers face more challenges in farming than ever before. Examples include competition and consolidation within the global marketplace and low and unpredictable product prices. Evaluation and development of alternative market outlets is one means of helping small farms to become more economically sustainable. From 2000 to 2020 the US population is expected to increase by between 50 and 80 million people. A concomitant increase in consumer demand for local, fresh, specialty and organic produce is also projected. Alternative market outlets that skillfully link local or regional small-scale production with evolving consumer demand are currently lacking. We hypothesize that there is considerable potential for helping small farmers sustain or improve their economic position and fulfill consumer needs by exploiting these connections in the marketplace. This investigation draws from the literature to ascertain whether horticultural auction markets may provide such a link for small farms. The paper characterizes horticultural auction markets using current and historical examples, discusses marketplace changes with special reference to consumer demand, and appraises the value of this market model with respect to the dual challenge of meeting both farmers' and consumers' needs. Current marketplace research and characteristics suggest measured optimism for horticultural auction markets to provide a small farm–consumer link.
Influence of farm management style on adoption of biologically integrated farming practices in California
- Sonja Brodt, Karen Klonsky, Laura Tourte, Roger Duncan, Lonnie Hendricks, Cliff Ohmart, Paul Verdegaal
-
- Journal:
- Renewable Agriculture and Food Systems / Volume 19 / Issue 4 / December 2004
- Published online by Cambridge University Press:
- 12 February 2007, pp. 237-247
-
- Article
- Export citation
-
We consider the adoption of biologically integrated agricultural practices from the perspective of farm management style. Adoption decisions for farming practices must fit into a broader farm decision-making context that incorporates economic, environmental, social, family and personal considerations, as well as use of agricultural information sources. Drawing from a study of California almond and winegrape growers, we demonstrate that management styles differ substantially among farmers, these differences affect use of information sources and adoption of biologically based practices on the farm, and such adoption does not negatively affect crop performance. We used Q-methodology, a method for eliciting qualitative data using a variant of factor analysis, to identify three distinct management styles among a purposive sample of 40 growers. The Environmental Stewards' management style places higher priority on conservation of natural resources than on getting the highest possible yields or profits. Production Maximizers, with a different style, prioritize more traditional goals of producing the highest possible yields and quality and focusing resources on the farm rather than on outside concerns. Networking Entrepreneurs, on the other hand, value learning about innovative techniques in social contexts such as informational field days, evaluate new information with a business-like attitude and enjoy off-farm interests. A two-season mail survey of farming practices and information sources demonstrated that differences in management styles affect the adoption of practices. Environmental Stewards were more likely to practice biological pest control and encourage wildlife and less likely to use the most toxic chemicals. Production Maximizers had a greater tendency to use prophylactic and broad-spectrum chemicals, while Networking Entrepreneurs preferred more innovative biological pest controls but tended to avoid time-consuming cultural practices. Production Maximizers were distinguished by less use of more social forms of communication, such as attending field days and talking with other growers. Crop health and quality indicators showed that almost all growers were managing their crops very successfully, regardless of management style or choice of practices. These results hold important implications for efforts to increase the adoption of sustainable agriculture, especially by showing that contents and methods of outreach efforts must vary to accommodate diverse farm management styles.