EFFECT OF RICE STRAW COMPOST ENRICHED WITH POTASSIUM RICH MATERIALS ON DRY MATTER AND WATER CONSUMPTION OF BARLEY UNDER DROUGHT CONDITIONS

Abstract

The main objective of this research was to study the effect of rice straw compost as a source of potassium on the barley dry matter under drought conditions using three ratios of the value of water consumption (100%, 80% and 60%). A pot experiment was conducted using loamy and sandy soils in the greenhouse of Soil Sci. Dept., Fac. of Agric., Ain Shams University. The suggested treatments can be summarized as control (without compost addition), (rice straw compost), (1% rice straw + 1% banana compost), ( 1% rice straw + 1% vegetables compost) and (1% rice straw + potassium dissolving bacteria (PDB)). The obtained results show the value of time growth for barley under control,1% rice straw compost (RSC), 1% RSC+ 1% banana residues compost (BRC), (1% RSC+ 1% vegetables residues compost (VRC) and 1% RSC+ potassium dissolving bacteria (PDB), respectively. The maximum potassium availability of the loamy soil were 2.96, 3.58, 3.38, 3.2 and 3.35 meq/l at 475, 494, 508, 457 and 350 hour, respectively. The corresponding figures for the sandy soil were 475, 375, 550, 575 and 425 hour producing the maximum potassium of 0.41, 0.58, 1.71, 1.08 and 1.06 meq/l at different time growth under rice straw compost treatments. The effect both water consumption and its potassium content on barley dry matter was significant and clear effect noticeable by using the treatment of rice straw compost (RSC)+bananas residues compost (BRC) on water consumption under 100 and 60%.