Abstract
Abs tract: A two successive years completely ran d o mized field experiment with drip irrigated cucumber (Cucumis Sativus L. Var. Madina ) was conducted at El-katta, Giza Governorate to study the changes in some physico-bio- chemical properties of a v irg in sandy soil after treating with hydrophilic polymers and plantation. The hydrogel used was a mixture of an anionic “ polyacrylamide K polyacrylate 30% anionicity and a cationic “ polyacrylamide allylamine hydrochloride 20 % cationity “ hydrogels at the ratio of 2:3. Examined application rates of the hydrogel were 2, 3 and 4 g/plant pit. At the end of the growing season som e physi co-bio- chemical properties of the soi l were determined. Obtained results could be summarized as follows: 1-Applied conditioner positively affects hydrophysi cal properties of soi l. These include a- improving soi l structure expressed by water stabl e s tructural units > 0.25 mm in d ia me te r, and s tructure coefficient, dry s table s tructural units > 0.84 mm in diameter and wind erosion parameter indicating high resistance of the s o il ag a in s t both wind and water erosion and the destruction of the soil by tillage operations . b -decreasing soil bulk density as well as macro porosity (drainable pores) on the expense of micro ones. Therefore, water holding pores were in creased. c- increasi ng retai ned mois ture in the soi l at all sucti ons under study (from 0 to 15 bars.). Since the increase in water retained in the soi l at field capacity is far beyond that at wi lting percentages , available water was highly increas ed d - d e creasi ng mean diameter of s oil pores and in turn its water transm itting properties nam ely: infiltration rate, hydraulic conductivity and transm is si vity for vertical flow of water through soi l profile . Evaporation was als o decreased. 2-Soil conditioning p ositively affect chemical and biological properties of the soil. These effects are assembled in th e following: a-slightly decrease soil pH. b- increasing both CEC of the soil and its s p e cific surface area indicating an improvement in acti v a ting chemical reactions in the s oil. c- increas ing OM , organic carbon and total nitrogen in the soi l. Because the increase in organic nitrogen is higher than that in organic carbon, narrower C/N ratio of treated soi l was obtained indicati ng the mineralization of organic nitrogen compounds and hence the possi bility to s ave and provide available forms of N to growing plants. d- increasi ng N, P and K in treated soi l. e- improving the biological activity expressed as total count of bacteria, i.e Az otobactor sp, and PDB, fungi and actinomycetes in the soi l and the activity of both dehydrogenase and phosph atas e. 3- In all cas es , improvements in s oil properties are posi tively affected by the application rate of the conditioners .
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Judged adjacent: soil study without a plant endpoint — claims were not extracted. This is a scope decision by the model, not a statement about the paper’s findings.