Effect of synthetic ferric hydroxides on retention of zinc by sand and its extractability

Abstract

Most agricultural leftovers are secondary products which should be made useful by conversion to organic fertilizers, safe energy sources, oi manufactured, such as to sustain organic farming and environment anti-pollution protection. Cotton wood slicks arc among the most important leftovers, reaching in volume for Sharkia govcrnoralc to almost 121 thousands m.l. /year, representing nearly 10.4% of the corresponding estimate at country level. The paper targeted an estimation of both economic and environmental (returns of cotton wood s i n k s suggested variant uses, at both farm and regional levels, results should that farm returns may increase by nearly L.E. 296 /feddan through conversion to organic matter for fertilization. Conversion to compressed wood (MDF) would realize revenue of about L.E 6951/feddan and L.E 4931 /feddan for ami- fire untreated, and treated wood, respectively. Moreover, production as source of energy, where the total value may reach L.E. 32.7 million /year, as equivalent to almost 43.6 thousands m.t. of petrol. According, the study recommends projects, especially in Northern rural areas of Egypt, through provision of low interest - rate loans and application of rural environment protection research recommendations, besides establishing a TV. channel specia