|
|
|
| Registros recuperados: 479 | |
|
|
| ZOHAIB,A.; ANJUM,S.A.; JABBAR,A.; TABASSUM,T.; ABBAS,T.; NAZIR,U.. |
| ABSTRACT The present study was aimed at determining the allelopathic influence of water extracts at varying concentrations (2.5% and 5% w/v) and residues with varying decomposition periods (0, 15 and 30 days) at 2% (w/w) concentration of four weeds (Trigonella polycerata, Vicia sativa, Lathyrus aphaca, Medicago polymorpha) against rate, synchronization and time of germination, and biomass partitioning of rice through plant and soil bioassays. Germination and biomass partitioning in rice plants were inhibited by extracts and residues. The maximum decrease in energy of germination (88.6%) and increase in time for 50% germination (210.4%) were caused by the L. aphaca extract at 5% concentration as compared to control. Root and shoot, fresh weight (13.6 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelopathy; Leguminous weeds; Rice; Germination; Biomass partitioning. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100269 |
| |
|
| |
|
|
| Noldin,J.A.; Chandler,J.M.; McCauley,G.N.. |
| Red rice is a troublesome weed in irrigated rice production and is spread through contaminated commercial rice seed and machinery. Seed dormancy is a major trait for red rice. Studies were carried out at two locations to determine red rice seed longevity in the soil of several ecotypes from four US states. Five months after burial near Beaumont, Texas only three ecotypes had viable seed (<1%) when buried at 5 cm, but 9 ecotypes had viable seed after two years when buried at 25 cm. At the thirty-sixth month after burial, ecotypes Arkansas 2, Louisiana 2 and 4, Mississippi 4 and Texas 1 had viable seeds, but at less than 1%. Freshly harvested red rice seeds buried at 12 cm near College Station, TX, survived longer than seeds placed on the soil surface.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Red rice; Oryza sativa; Rice; Seed survival; Seed dormancy; Strawhull ecotypes; Blackhull ecotypes. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582006000400001 |
| |
|
| |
|
| |
|
| |
|
|
| Feizabadi, Yaser. |
| Rice comes second after wheat in Iran`s food consumption economy. Rising population and recent growth in GDP has made Iran one of the greatest rice importer countries all over the world. That is why rice marketing has always been a controversial issue in Iran`s agricultural economics. To study rice marketing system in Iran, this paper aims to calculate rice marketing margin, market efficiency and marketing cost coefficient in seaside Mazandaran province( where 70 percent of domestic rice production is obtained )Over the period 2000-2010. Results show that firstly HYV`s wholesale marketing margin is less than local varieties in 2000 while this trend is reversed in 2010. Secondly, retail marketing margin, total marketing margin, market efficiency and cost... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Mazandaran Province; Marketing Margin; Rice; Marketing; Q13. |
| Ano: 2011 |
URL: http://purl.umn.edu/108944 |
| |
|
|
| Pardey, Philip G.; Alston, Julian M.; Chan-Kang, Connie; Magalhaes, Eduardo Castelo; Vosti, Stephen A.. |
| In general, reported rates of return to agricultural R&D are high, but questions have been raised about upward biases in the evidence. Among the reasons for this bias, insufficient attention to attribution aspects-matching of research benefits and costs-is a pervasive problem, the magnitude of which is illustrated here with new evidence for Brazil. Over the period 1981 to 2003, varietal improvements in upland rice, edible beans, and soybeans yielded benefits attributable to research of $14.8 billion in present value (1999 prices) terms; 6.1 percent of the corresponding value of crop output. If all of those benefits were attributed to Embrapa, a public research corporation accounting for more than half Brazil's agricultural R&D spending, the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Brazil; Agricultural R&D; Attribution; Soybeans; Rice; Beans; Benefit-cost ratios; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2002 |
URL: http://purl.umn.edu/14422 |
| |
|
|
| Najafi, Bahaeddin; Bakhshoodeh, Mohamad. |
| To evaluate the government intervention effects on growth of rice production in Iran, the nominal protective rate was calculated and a Nerlove supply model was applied to a time series of 1983-1998. The results showed that in the majority of these years, producers has not been supported and therefore, redirecting the rice market is recommended. In order to get more efficient approach than the government intervention, diminishing the share of the government in the market and strengthening the private sector may be listed on the top of a list that could be regarded as a plan for making rice production profitable. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Nominal protection rate; Rice; Iran; Agricultural and Food Policy. |
| Ano: 2002 |
URL: http://purl.umn.edu/24922 |
| |
|
|
| Hignight, Jeffrey A.; Watkins, K. Bradley; Anders, Merle M.. |
| No-till (NT) has been shown to reduce fuel, labor, and machinery costs compared to conventional-till (CT) but very few rice producers in Arkansas practice NT. The low adoption rate is most likely due to difficulties in management but also limited information on the profitability and risk of NT. Most rice producers are knowledgeable on NT costs savings but consider it less profitable due to yield reductions offsetting costs savings. This study evaluates production costs, crop yields, and economic risk of both NT and CT in five rice-based cropping systems (continuous rice, rice-soybean, rice-corn, rice-wheat, and rice-wheat-soybean-wheat). Yields, crop prices, and key input prices are simulated to create net return distributions. Stochastic efficiency... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Cropping systems; Rice; No-till; Certainty equivalent; Risk premium; Crop Production/Industries; Farm Management; Financial Economics; Land Economics/Use; Production Economics; Risk and Uncertainty. |
| Ano: 2010 |
URL: http://purl.umn.edu/56354 |
| |
|
| |
|
| |
|
|
| McKinsey, James W., Jr.; Evenson, Robert E.. |
| This paper presents a model of the Green Revolution in India, in which the development and diffusion of HYVs, the expansion of irrigation and the expansion of multiple-cropping are treated as endogenous responses to more basic investments in agricultural technology and infrastructure, as well as to climate and edaphic endowments. We incorporate explicit climate-technology interactions in the model, in order to identify climate effects on the diffusion of HYVs, irrigation and multiple-cropping, and on Net Revenue to agriculture. We find that climate affects technology development and diffusion, and that technology development and diffusion affect the impacts of climate on agricultural productivity in India. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Green Revolution; India; HYV; Rice; Wheat; Climate; Agricultural research; International Development; 112; 121; 226; 620; 710. |
| Ano: 1999 |
URL: http://purl.umn.edu/28452 |
| |
|
| |
|
| |
|
|
| Pale, Eric. |
| During the first quarter of 2008, the nominal prices of major food items have reached their highest level in nearly 50 years, while prices reached their actual level record in nearly 30 years. Indeed, prices of agricultural products rose sharply in 2006 and 2007 reported an increase more marked in the first quarter of 2008. The FAO food price index rose an average of 8% in 2006 compared to the year earlier and 24% in 2007 compared to 2006. The increase in the average index for first three months of 2008 compared to first quarter 2007 was 53%. Soaring persistent price is mainly due to vegetable oils, which rose to more than 97% during the same period, followed by cereals (87%), dairy (58%) and rice (46%). According to the latest report published by the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Burkina Faso; Maize; Rice; Parity Price; Agricultural and Food Policy; Food Security and Poverty; International Relations/Trade; Marketing. |
| Ano: 2010 |
URL: http://purl.umn.edu/93026 |
| |
|
| |
|
|
| Abdulai, Awudu; Huffman, Wallace E.. |
| This paper employs a stochastic frontier model to examine profit inefficiency of rice farmers in the Northern Region of Ghana using farm-level survey data. The efficiency index, based on a half-normal distribution of the stochastic error term is related to farm and household characteristics. The empirical results show that farmers' human capital represented by the level of schooling contributes positively to production efficiency, suggesting that investment in farmers' education improves their allocative performance. Access to credit and greater specialization in rice production, are found to be positively related to production efficiency. A farmer's participation in nonfarm employment and being older, however, reduce production efficiency. Farmers... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Africa; Ghana; Production efficiency; Profit frontier; Rice; Crop Production/Industries. |
| Ano: 1998 |
URL: http://purl.umn.edu/18271 |
| |
|
| |
|
| |
| Registros recuperados: 479 | |
|
|
|
