Applied Water Requirements of Selected Crops
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Publisher:
Published: 1974
Total Pages: 80
ISBN-13:
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Author:
Publisher:
Published: 1974
Total Pages: 80
ISBN-13:
DOWNLOAD EBOOKAuthor: J. Doorenbos
Publisher:
Published: 1975
Total Pages: 202
ISBN-13:
DOWNLOAD EBOOKCalculation of crop evapotranspiration; Selection of crop coeficient; Calculation of field irrigation requirements.
Author: Rashmi Mehta
Publisher: Ideal Thoughts
Published: 2018
Total Pages: 106
ISBN-13: 9789386283702
DOWNLOAD EBOOKAuthor: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
Published: 2019-04-21
Total Pages: 243
ISBN-13: 0309473926
DOWNLOAD EBOOKFor nearly a century, scientific advances have fueled progress in U.S. agriculture to enable American producers to deliver safe and abundant food domestically and provide a trade surplus in bulk and high-value agricultural commodities and foods. Today, the U.S. food and agricultural enterprise faces formidable challenges that will test its long-term sustainability, competitiveness, and resilience. On its current path, future productivity in the U.S. agricultural system is likely to come with trade-offs. The success of agriculture is tied to natural systems, and these systems are showing signs of stress, even more so with the change in climate. More than a third of the food produced is unconsumed, an unacceptable loss of food and nutrients at a time of heightened global food demand. Increased food animal production to meet greater demand will generate more greenhouse gas emissions and excess animal waste. The U.S. food supply is generally secure, but is not immune to the costly and deadly shocks of continuing outbreaks of food-borne illness or to the constant threat of pests and pathogens to crops, livestock, and poultry. U.S. farmers and producers are at the front lines and will need more tools to manage the pressures they face. Science Breakthroughs to Advance Food and Agricultural Research by 2030 identifies innovative, emerging scientific advances for making the U.S. food and agricultural system more efficient, resilient, and sustainable. This report explores the availability of relatively new scientific developments across all disciplines that could accelerate progress toward these goals. It identifies the most promising scientific breakthroughs that could have the greatest positive impact on food and agriculture, and that are possible to achieve in the next decade (by 2030).
Author: Van Opstal, J., Droogers, P., Kaune, A., Steduto, P., Perry, C.
Publisher: Food & Agriculture Org.
Published: 2021-03-18
Total Pages: 63
ISBN-13: 9251341362
DOWNLOAD EBOOKThis technical document contains clear and practical guidelines on how to implement real water savings in agriculture through interventions for enhancing crop water productivity. A distinction is made between real water savings and “apparent” water savings. Apparent water savings record reductions in water withdrawals but do not account for changes in water consumption. Real water savings record reductions in water consumption and non-recoverable return flows (runoff or percolation). This guidance document emphasizes the paradox of water savings at field and basin scales, which usually do not translate into increased water availability for other users, as is commonly believed.
Author: William R. Park
Publisher:
Published: 1974
Total Pages: 428
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1991
Total Pages: 806
ISBN-13:
DOWNLOAD EBOOKAuthor: D. J. Bandaragoda
Publisher: IWMI
Published: 1994
Total Pages: 66
ISBN-13: 9290903066
DOWNLOAD EBOOKThe Directorate of Land Reclamation (DLR), which was set up in 1945, is a special unit of Punjab's Irrigation and Power Department for undertaking research and field operations to combat the problem of salinity. Approaching the end of five decades of existence, the directorate is yet to demonstrate its effectiveness in its assigned task; its inability to fully cope with the conditions of a fast changing irrigation environment makes this rather an illusive goal. In the selection of lands for reclamation, the Directorate is heavily dependent on the visual salinity survey (Thur Girdawari) carried out every year by the Irrigation Department's field staff. This visual survey appears to be a quick and cost-effective method of assessing surface salinity, but its exclusive use as the criterion for selection of affected land is a questionable approach. According to original departmental procedure, reclamation activities were confined to only two of the five classes of soil identified by the visual salinity survey, but the current practice of including all the types of salt-affected soils in reclamation operations has made the selection process more subjective. Surprisingly, the DLR is not using its existing laboratory facilities optimally to better identify the salt-affected lands. Soil testing in visually identified lands could also help define the reclamation operations more scientifically in addition to improving the selection methods being used. While formal procedure requires the Directorate to communicate to farmers the details of planned reclamation schemes, farmer awareness of the reclamation program seems to be poor and only a few farmers in the study area readily acknowledge agency assistance in obtaining relevant information. In practice, the proposals for reclamation schemes are often initiated by some influential farmers. It is a requirement that the amount of water made available for reclamation be over and above the design supply of a given distributary, and special reclamation outlets can be given from a distributary only on the basis that its tail will not suffer. However, the study shows no evidence to show that extra water was made available during the operation of reclamation outlets; further, tail-end shortages were observed in all the distributaries under the study. In a context where the tendency is to give scant consideration to irrigation rules and procedures, it is unlikely that the Directorate of Land Reclamation in its present form and status will succeed in implementing an extensive program of reclamation operations. For the Directorate to be effective in its legitimate functions and to make it an operationally viable and socially acceptable organizational unit, adequate policy and institutional support seem to be necessary.
Author:
Publisher:
Published: 1995
Total Pages: 390
ISBN-13:
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