Conditioning effect of compost and acrylamide hydrogels on a sandy calcareous soil. Ii-physico-bio-chemical
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Answer:
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Explanation:
complete randomized field experiment with four replications was conducted at El-Saff (Giza overnorate) Egypt, using drip irrigated tomato (Lycopersicum esculentum, hybrid Wady), as the indicator plant. The treatments were: 1) un-treated sandy calcareous soil. 2 and 3) soil treated with organic compost (OM) at the rates of 1 kg/plant pit (12 tons/fed.) or 2 kg/plant pit (24 tons/fed.). 4 and 5) soil treated with 2 g plant pit (24 Kg/fed. or 4 g/plant pit (48 Kg/fed.) of a mixture of the anionic hydrogel (polyacrylamide K polyacrylate gel 30% anionicity and the cationic hydrogel polyacrylamide allylamine hydrochloride gel 20% cationicity at the ratio of 2:3 (G). 6, 8 and 9) soil treated with mixtures of OM and G at the rates of 1 kgOM + 1 gG, 1 kgOM + 2 gG, 2 kgOM + 1 gG, 2 kgOM + 2 gG/plant pit, respectively. At the end of the growing season i.e. after 150 days from plantation some physical, chemical and biological properties of the soil were determined Obtained results could be summarized as follows: 1. Applied conditioners positively affect hydrophysical properties of the soil. These include, (a) improving soil structure expressed by water stable structure units > 0.25 mm in diameter and structure coefficient, dry stable structural units > 0.84 mm in diameter and wind erosion parameter indicating high resistance of the soil against both wind and water erosion and the destruction of the soil by tillage operations, (b) decreasing soil bulk density as well as macro porosity (drainage pores) on the expense of micro ones.