Hossein Sharifan; P. Mokhtari; A. Hezarjaribi
Abstract
By considering the shortage of water resources in our country and dominant share of agriculture in making use of these resources, economizing and saving in this sector and using management practices for raising the efficiency of water consumption is necessary and essential. Super absorbent polymers, ...
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By considering the shortage of water resources in our country and dominant share of agriculture in making use of these resources, economizing and saving in this sector and using management practices for raising the efficiency of water consumption is necessary and essential. Super absorbent polymers, polymer gel, Are hydrophilic and are able to absorb a vast amount of water, Salt water, or physiological solutions and enhance the act of saving water in soil. Using super absorbent polymer is one of the methods that enhances the utilization of water that not only provide conditions which makes quality performance better, it also considerably increases the water use efficiency. In this research we examined the effect of super absorbent on the infiltration equation parameters (Kostiakov _ Lewis) through the advance time calculated and the effects of superabsorbent on these equations also were examined. The experiment were performed in the educational farm of the university of natural resources and agriculture in a no cultivation conditions.in this research four combinations of superabsorbent polymer A200 with soil which were composed of 0,7,11,16gr of polymers in square at a depth of 25cm and the electric current was 0.75 liter per second were considered. The experiment were performed four times. The results indicated that by adding polymers A200 to the soil, advance time and rollback time were increased. also therefore the Infiltration and the cumulative soil Infiltration were increased.
H. Sharifan; A. Alizadeh
Abstract
Abstract
In order to estimate the reference evapotranspiration different equation is used. Validity of each methods depends upon the climate and the parameters which are used in these equations. Therefore it is necessary to calibrate these methods for any specific area and for any desired frequency. ...
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Abstract
In order to estimate the reference evapotranspiration different equation is used. Validity of each methods depends upon the climate and the parameters which are used in these equations. Therefore it is necessary to calibrate these methods for any specific area and for any desired frequency. In this study common temperature and radiation based methods were used for calculating crop evapotranspiration and the results were compared with standard method of estimating reference evapotranspiration. The results showed that Jensen-Haise(J-H) method overestimate ET compare to Hargreaves-Samany(H-S) method. The difference is more in 3 days period of irrigation than 5 days period. Also for wheat and barely H-S method estimates higher value of ETc compared with J-H method. However, J-H method overestimate ETc for cotton and rice. By increasing the probability level, the difference between calculated ETc by J-H and H-S decreased significantly.
Key words: Peak water requirement, ETo, ETc, Radiation, Temperature, Probability
H. Sharifan; B. Ghahraman; A. Alizadeh
Abstract
Evaluation of Rainfall Effect on Programing of Agricultural Management (Case Study: Golestan region)
Abstract
Securing of water need in agricultural is important. Precipitation are one of the most important of water resources in agricultural, in Golestan province, especially , because Alborze mountains ...
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Evaluation of Rainfall Effect on Programing of Agricultural Management (Case Study: Golestan region)
Abstract
Securing of water need in agricultural is important. Precipitation are one of the most important of water resources in agricultural, in Golestan province, especially , because Alborze mountains are in Golestan south. In research has investigated effects of rainfall to cropping pattern and intensification in Golestan farms. Rainfall used: a) have forecasted rainfalls by Minitab-13 program, b) Different probabilities of rainfalls by LST Program. Then estimated effective rainfall (by USDA method). For optimization used Lingo-8 program. Evaluations shown that in southern region (climate is: smi wet), if rainfall decreased, area of tomato and potato decreased , but canola area increased. In central and north regions (climates are: semi dried to dried), if rainfall decreased, watermelon area decreased, but canola area increased. Also if drought conditions, planting of canola, watermelon and cotton crops are important.
Key words: Cropping pattern, Intensification, Precipitation, Golestan
