EFFECTS OF SOME NATURAL SOIL AMENDMENTS AND WATER REQUIREMENTS ON THE GROWTH AND CHEMICAL CONSTITUENTS OF SOME LAWNS (PASPALUM VAGINATUM, L.)

Document Type : Original Research Article

Authors

1 Floriculture, Ornamental Horticulture and landscape Gardening Dept., Fac. of Agric., (EL-Shatby), Alexandria Univ. Egypt

2 Fac. Agric., Omar-Almuktar Univ., Bayda, Libya

Abstract

The aim of this research was to improve properties of calcareous soil by adding two natural soil conditioners (sand + compost) with different rations, i.e., calcareous, calcareous + composted leaves (3:1 v/v), calcareous + sand (3:1 v/v) and calcareous + sand + composted leaves (1.5:1.5:1 v/v/v))  combined with  three rates of irrigation 5.00 l/m2  as severe stress, 10.00 l/m2  as moderate stress and 15.00 l/m2  as normal stress) on Paspalum. The experimental design was a split-plot design. Natural soil amendments were listed as the primary component, with various irrigation rates included as a subfactor. Resulted from media consisting of calcareous + sand + composted leaves (1.5:1.5:1 v/v/v) with the addition of the third level (15.00 l/m2) of irrigation rate, gave the highest reduction for the time required to give covering complete (44.916 days) and produced the maximum increase in total fresh (989.772 g/m2) and dry weight (221.492 g/m2) of vegetative growth, fresh weight of rhizome (379.854 g/m2) and dry weight (85.551 g/m2). Also, highest significant increase in the total chlorophylls (258.595 mg/100 g L.F.W.), carotenoids (60.779 mg/g L.F.W.) and total carbohydrates (267.384) in rhizomes at 15.00 l/m2 with the growing medium of calcareous + sand + composted leaves (1.5:1.5:1 v/v/v). Natural soil amendments (sand, plant compost) reduced the harmful effects of stress and improved plant resistance to water stress when using irrigation at the moderate stress rate of 10.00 l/m2. Accordingly, it could be recommended that high-quality lawns (P. vaginatum, L.) be produced by growing Paspalum in a mixture of calcareous + sand + composted leaves (1.5:1.5:1 v/v/v) as the best natural soil amendments and irrigation with the rate of 10 as moderate stress and/or15.00 l/m2.

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