Water requirement

Xem 1-20 trên 364 kết quả Water requirement
  • In this paper, irrigation water requirement of spring season paddy with the meteorological data at Lang, Ha Nam, Hung Yen, and Nam Dinh rain gauge stations of Vietnam are forecasted, based on the projected meteorological data of 6 global climate models under A1B climate change scenario after using the bias correction and spatial downscaling to increase the horizontal resolution.

    pdf8p danhvi95 05-12-2018 20 0   Download

  • The reference evapotranspiration (ETo) is an important agrometeorological parameter which has been used in a number of applications. In present study daily ETo was determined for seven districts of Marathwada region having long period (29-35 years) weather data by Hargreaves method. The Kc values for kharif sorghum, maize and pearlmillet as given in FAO-56 paper was used to calculate the daily crop water requirement (ETc). The results revealed that, ETo reaches to its peak value during 28th April to 18th May at all the districts of marathwada region.

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  • Crop water Requirement (CWR) is the key to design a suitable irrigation system for a particular crop. In this paper CWR of major vegetable crops for six agro-climatic zones of Madhya Pradesh is estimated on the basis of Reference Evapotranspiration. The study is performed for major vegetable crops namely tomato, onion, pea, brinjal, potato and okra. The crop water requirement found to vary with stages of the crop growth and the reference evapotranspiration.

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  • The global consumption of water is doubling every 20 years, more than twice the rate of human population growth. As per one of the estimate of Food and Agriculture organization (FAO), 70-80 per cent of the increase in food demand between 2000 and 2030 will have to be met by irrigation. Efficient water use can increase crop diversity, produce higher yields, enhance employment and lower food prices.

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  • A study was conducted at College of Agricultural Engineering and Technology, Odisha University of Agriculture and Technology, Bhubaneswar during 2014-15 to find out the water requirement of South Eastern Ghat zones of Odisha. Water plays a vital role for every living being. Water is and will become scarce natural resource in the near future. A clear understanding of the water balance is essential for exploring water saving measures.

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  • This study was conducted in order to determine effect of water requirement, irrigation treatments and water use efficiency of capsicum crop. Experiments were carried out in the College of Agricultural Engineering, Madakasira between January to May 2018, with cv. Indra. The maximum yield of 4.3 t ha-1 was obtained from treatment 1(1.0 ETc ). The seasonal irrigation water amount of treatment was 562.5 mm determined by AquaCrop 6.0 model.

    pdf6p trinhthamhodang5 16-05-2020 5 0   Download

  • The objective of the study was to estimate consumptive water use and agronomic water productivity for different crops grown in different regions of Uttar Pradesh and to identify the regions for comparative advantage of crop production based on water productivity and crop yield. The study was based on the secondary data and it was collected from different sources. The Crop Wat model was used for estimation of consumptive water requirement for crop production.

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  • Water saving by innovative techniques is essential to prevent salinity and land degradation in paddy production. Therefore, the field investigations were conducted in the farmer’s field under the jurisdiction of the University of Agricultural Sciences (UAS) Raichur during the kharif 2015 and kharif 2016 using randomized complete block design (RCBD) with 7 treatments to determine water requirement of Paddy under different levelling, cultivation practices and irrigation methods for paddy production.

    pdf7p caygaocaolon8 07-11-2020 2 0   Download

  • The research shows that the irrigation management model can effectively and efficiently estimate the crop water requirements. The model, that calculates evapotranspiration and crop water requirements, allows the development of recommendations for improved irrigation practices, the planning of irrigation schedules under varying water supply conditions and yields reduction under various conditions.

    pdf9p cothumenhmong9 18-01-2021 1 0   Download

  • Field experiments were conducted during 2015-16 and 2016-17 to study the effect of irrigation and N levels on nutrient uptake, water use efficiency and productivity of onion (Allium cepa L.) in Himachal Pradesh. Twelve treatment combinations comprising four irrigation level i.e. 4 cm irrigation at IW/CPE ratio 1.2 (I1), 1.0 (I2), 0.8 (I3), 0.6 (I4) and three N levels i.e. 75 (N1), 100 (N2) and 125 per cent (N3) of recommended dose of N, were replicated thrice in a Randomized Block Design.

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  • Insufficient water supply is one of the most important factor governing agricultural productions. In addition to rainfall, a thorough knowledge of seasonal values of evaporation and crop transpiration, runoff, deep drainage and soil water storage is required to estimate the water need of crop. Water management is crucial to rightly offer and economize on water use in improvement of rice productivity.

    pdf7p chauchaungayxua4 18-03-2020 5 0   Download

  • Irrigation Scheduling is a prime requirement for optimizing the use of water resources in irrigated agriculture. The majority of irrigation projects in India perform at a low overall efficiency of 30% (Sarma and Rao, 1997), which provides an opportunity for meeting the increasing water demands by adopting efficient methods of water management. The National Commission on Integrated Water Resources Development (NCIWRD, 1999) has projected that India’s surface irrigation systems will work at only 40, 50 and 60% efficiency levels in 2010, 2025 and 2050, respectively.

    pdf7p trinhthamhodang4 22-03-2020 3 0   Download

  • In the present study, the review of the literature has been made to appraise the impact of climate change on crop water requirement, availability of irrigation water and suggested coping strategies. Most of the studies presented indicate that there is an increase in irrigation and crop water requirement. There are few studies which suggest that there may not be a change in crop water requirement in event of climate change. The studies also suggest that climate change would affect groundwater recharge and water availability for irrigation.

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  • The crop water requirement (CWR) and irrigation requirement (IR) of rice crops were calculated using a web based software. Relevant crop coefficients (Kc), duration of crops and cropping pattern were used to calculate CWR from ETo. These coefficients present the relationship between references (ETo) and crop evapotranspiration (ET crop) or ET crop = Kc * ETo. The covered area of all crops (canopy cover) was collected.

    pdf9p caygaocaolon6 30-07-2020 1 0   Download

  • Agricultural sector consumes the largest percentage of freshwater to cater to the need for food forever increasing population but the resources like land and water are becoming scares. Therefore, we need to increase water use efficiency by incorporating the modern drip method of irrigation. One of the ways of alleviating water scarcity is by enhancing its use efficiency or productivity.

    pdf11p nguaconbaynhay7 15-08-2020 4 0   Download

  • The state of West Bengal has 2.7 per cent of geographical area and 7.5 per cent of water resources. Among the various natural resources, water is considered the most precious and vulnerable input for sustain biological productivity, maintain environmental quality and sustain plant, animal, human health and augmented agricultural production., a field experiment was conducted at the Regional Research Station, Gayeshpur, BCKV during the winter season of 2013-2014 to assess water Requirement and water use efficiency of tuberose.

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  • Water is finite on earth. There is a fixed amount of water which neither decreases or increases. Fresh water is a renewable resource because of the water cycle. From a human perspective the source of freshwater is rainfall. Most of this rainfall is used directly for vegetative growth, such as natural vegetation, pasture, rain-fed maize etc. This process, known as transpiration, is highly productive and produces in Southern Africa the bulk of food crops.

    pdf102p thanhtrinhqc 10-05-2013 63 14   Download

  • Over the past 15 years, evidence has accumulated that the nation's ground water resource, which supplies more than 50 percent of the population's drinking water, is threatened not only by excessive overdrafts but also by contamination caused by past and present industrial, agricultural, and commercial activities. In the United States, it is estimated that more than 300,000 sites may have contaminated soil or ground water requiring some form of remediation (see Table 1-2 in Chapter 1).

    pdf334p cronus75 18-01-2013 36 4   Download

  • Marine oil spilled frequently in the Vietnamese waters requires that give rise to the development of effective response system to mitigate or reduce the impacts of an oil spill. In this study, the physical characteristics of types of oil group such as density of oil, evaporation of oil, dispersion of oil were considered.

    pdf5p vidoraemon2711 04-06-2019 7 0   Download

  • The agricultural sector faces daunting challenges because of climate change, particularly amidst increasing global water scarcity, which threatens irrigated lowland rice production. By 2025, 15-20 million ha of irrigated rice is estimated to suffer from some degree of scarcity. Rice systems provide a major source of calories for more than half of the world‟s population; however, they also use more water than other major crops. Irrigated lowland rice not only consumes more water but also causes wastage of water resulting in degradation of land.

    pdf11p kethamoi2 14-12-2019 15 0   Download


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