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• W3204887046 abstract "Ameliorating the saline-sodic soil process represents an important target inthe agricultural security program of Egypt. In this concern, field trial wasconducted for improving salt-affected clay soil provided with tile drainagesystem at Mehallet Mousa, Kafr El-Shiekh Governorate, Egypt. The main target ofthis work was at identifying the effective role of applied gypsum, as soil chemicalamendment, with different rates on physico-chemical and hydrological propertiesof such soil as well as maximizing its productivity from maize and wheat crops.The applied gypsum treatments were categorized into: i. control without appliedgypsum, ii. 3.75 ton gypsum/fed ≈ 75 % of gypsum requirements (GR) for theuppermost 15 cm, iii. 5 ton gypsum/fed ≈ 100 % GR and iv. 6.25 ton gypsum/fed ≈125 % GR. The applied gypsum rates were uniformly spread on surface andthoroughly mixed with the soil top 15 cm, and then followed by recycle ofwetting and drying was repeated four times through period of about two months..A recycle of wetting and drying was repeated four times through period of abouttwo months. Soil samples at depths of 0-15, 15-30, 30-45 and 45-60 cm wereperiodically collected after 3, 6, 9 and 12 months from starting the experiment todetermine soil physico-chemical, i.e., ECe, ESP, salt leaching index, bulk density,infiltration rate, aggregation index and quickly drainable pores. Moreover, theshape of water table between drains, water table depth were monitored as well asthe drainage intensity factor a and the rate of water drawdown were calculated.The obtained results revealed that the reduction percentages of soil salinityafter 3, 6, 9 and 12 months from starting the experiment reached 30.3, 33.1, 35.4and 45.0 % for the applied gypsum rates 75 % GR vs 34.6, 36.9, 45.6 and 53.3 %for 100 % GR and 35.0, 66.6, 69.9 and 75.7 % for 125 % GR, respectively. Thatwas true, since additional gypsum in excess of the requirement helped speedily soilamelioration process. In general, the soil salinity reached the safe limits of soilsalinity (ECe= in water table level differs from one day to another as well as the applied gypsumrates, probably due to the nature of the stratified layering of such Nile alluvial soil.The average rate of water table drawdown after one year of gypsum applicationmounted 35.2, 44.8 and 95.0 % for soils treated with 75 %, 100 % and 125 % GRas compared with the initial state, respectively. In general, lowering the water tablehas given the top soil chance to dry, shrink and creating water passageways. Itwas also noticed that the drainage intensity factor (a) tended to increase withincreasing the applied gypsum rate, where its greatest value was achieved at 125 %GR, may be due to the increase of released Ca2+ and its positive action to link clayparticles, and in turn enhance soil internal drainage and water movement to drains.In addition, parallel pronounced decrease in the total water resistance wasassociated with increasing the applied gypsum rate, i.e., 7.69, 23.07 and 30.77 % at75, 100 and 125 % GR, respectively. This means that applied gypsum led toimprove the soil structure which helped in creating more permeable soil mediumwith less resistance to water flow towards tile drains.The achieved amelioration in physico-chemical and hydrological propertiesof the studied soil positively reflected on the increases of grain yields of bothsummer maize and winter wheat, which were approached 27.8, 50.0 and 61.1 % formaize vs 25.7, 42.9 and 57.1 % over the control for wheat at 75, 100 and 125 %GR, respectively. Finally, the obtained results suggest that this work is consideredas scientific and logic fundamental base for successful agricultural developmentof such salt affected area as well as possible to increase unite area income" @default.
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• W3204887046 date "2010-07-01" @default.
• W3204887046 modified "2023-09-24" @default.
• W3204887046 title "EFFECT OF APPLYING GYPSUM ON SOME PHYSICO-CHEMICAL AND HYDROLOGICAL PROPERTIES OF A SALINE-SODIC CLAY SOIL PROVIDED WITH A TILE DRAINAGE SYSTEM" @default.
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• W3204887046 doi "https://doi.org/10.21608/fjard.2010.195683" @default.
• W3204887046 hasPublicationYear "2010" @default.
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