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Tema: Técnicas agrícolas

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Medium Grains, High Stakes: Economics of Genetically Modified Rice in California

This paper gives estimates of the potential profitability of herbicide-tolerant (HT) rice cultivation in the Sacramento Valley region of California. We estimate first-year returns for the average producer and use both deterministic and stochastic methods to perform sensitivity analysis to account for heterogeneity and uncertainty with respect to potential adoption. Results show that adoption of the HT rice technology will likely be profitable for a majority of rice producers in California, even in the presence of nontransgenic price premia and technology fees.
University of California, Davis

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Frequently asked questions on “Farmers’ Producer Company (PC)” an Institutional PC concept

To the best of our information and understanding ‘Producer Company (PC)’ or the Institutional Producer Company (IPC), a federation of PCs, as dreamt by us is nonexistent as of Jan 2007. It is a company like any other company in the corporate world but with a difference, and how we visualize it to be formed and functioning. This concept has been talked about for over a decade and at different fora and some components of it have been implemented at several locations in different countries but not in its wholesomeness as discussed below.

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Is high yield possible with biological approaches ?

Biological approaches such as crop residues and biomass as surface mulch; growing Gliricidia sepium on field bunds as source of nitrogen for crops; compost, vermicompost and microbial biofertilizers as soil-building elements; and sources of crop nutrients, and microbial and herbal biopesticides to protect crops have been widely reported as valuable for crop production. Scope of these approaches to meet crop nutrients and crop-protection needs in place of chemical fertilizers and pesticides was examined. Published literature and websites were scanned to look for logically sound comparisons, particularly at on-farm scale. Because farmers using organic farming practices were the major users of some (not all) of the biological approaches, we ended up comparing organic and conventional farms. Experiments with treatments of biological versus conventional inputs (e.g. chemical fertilizers) within a given experiment were the other source of relevant data for comparative performance. Discussion in this paper is restricted to marginal and small farmers in rain fed areas. From the limited evidence, it was apparent that yields comparable to conventional agriculture were harvested by using biological approaches. In addition, a substantial improvement in soil quality due to the biological approach was reported suggesting that these yields would also be sustainable.

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A new index to assess soil quality and sustainability of wheat-based cropping systems

Sustainability index was calculated to assess soil quality under the influence of different fertilizer management practices. It is based on the area of the triangle in which nutrient index, microbial index and crop index of soil represented the three vertices of a triangle. Nutrient index reflected the nutrient status of soil and was calculated from the measurements of various soil chemical parameters. Microbial index was calculated by determining various soil microbial and biochemical activities and crop index by measuring of crop yield parameters. Eighteen soil indicators were determined to assess nutrient index, microbial index and crop index in order to compare the effect of different sources of nutrients such as green manure, farmyard manure and chemical fertilizer in a rice/corn– wheat rotation. The indices were applied to assess the sustainability of five field experiments with respect to the different fertilizer treatments. The long-term application of organic manures in rice/corn–wheat cropping system increased the index value because it increased the nutrient index, microbial index and crop index of soils. The use of only chemical fertilizers in the rice–wheat cropping system resulted in poor soil microbial index and crop index. In corn–wheat system, additional application of FYM at 10 t ha−1 before sowing corn made the system more sustainable than application of 100%NPK; the sustainability index values were 2.43 (the highest for this system) and 0.93, respectively.