Utilization of some soil amendments as a sources of micronutrients in soil and their effect on yield of cowpea plants Vigna angiculata L. in newly reclaimed soil

Two field experiment were carried out at the Farm of Institute of Studies and Envitamemil Research, Mirndyia University, Sadat City to evaluate the individual or the combined effect of both soil amewdmonfe and mineral fertilizers levels on yield and its components of cowpea (Kafr El Sheikh cv.) plant and Fe, Mn, Zn, Cu uptake. Experimental design was a randomized complete block, factorial. Factor (A) being mineral fertilizers at level of M0 (0 N, 0 P2O5, 0 K2O), Ml (50 N, 15 P2O5, 48 K2O) and M2 (75 N, 22 P2O5, 72 K2O) kg fad-1, factor (B) was soil amendments of none, chicken manure at the rate of 10 M3 fad-1, tafla (shale) at a rate of 8 ton. fad-1 and iron ore (2 % Fe) at a rate of 200 kg. fad-1. Application of soil amendments to the soil significantly increased, vegetative growth (plant height, number of branches/plant and fresh weight of plant foliage) yield and its components, i.e. lOO-seed weight, seed yield per plant in both season, exce pt the total dry yield of foliage and seeds per fed. The positive response was as follow Chicken manure bentonite iron ore. The relative average increase of both seeds yield per feddan, were 75.37 -1.57 -5.33 % and foliage were 76.59 -1.63 -5.52 % respectively. Application of mineral fertilizers significantly increased all parameters. The average values of the relative increase for NPK levels were, in seeds 3.82, 24.0 % for M1 and M2. Also in foliage they were 3.83, 23.99 % for M1 and M2. The highest values of seeds and foliage yields were obtained by the application of soil amendments with mineral fertilizer at the rate of M2 (75 N, 22 P2O5, 72 K2O). The relative increase of seed yield were 7.27, 129.23, 17.38, 9.60 % and of foliage 7.18, 129.86, 17.57, 9.60 % non-amended, chicken manure, bentonite and Iron ore, respectively. The concentration and uptake of Fe, Mn, Zn and Cu are more affected by application of soil amendments alone or combined with mineral fertilizers . The most effective treatments were those by applying soil amendments and mineral fertilizers at the rate of M2 according to the following order. Chicken manure Bentonite iron ore.