RESPONSE OF SOME FIELD CROPS RELEASE TO SLOW FERTTLIZERS
U, SCU, BCU, PGCU, Activety index, diffusivity, Maize. Sovbean
Trials were conducted to produce certain local either synthetic slow release fertilizers using or natural materials. An evaluation their activity index and air"tursulvr*itiyo ,u rfeoar efaecrhti lfiz"e.trisl i;;;l; the laboratory by phosphogypsum or coating with sulphur, bentonite result in "r.ur-d"p..rrion in trr.-uriourt, of rereased ::TiH,Jffi,:::LT efre* being rouna wr,, both importeJ,,lph;;^;,l,red urea (SCU) i n d i c ate th at th e rr ;i;, ili I 3 :.yl ;.Jj ,,: i,"ff f."Ifl :lT" ;J :f l, ifi : J i.gi?); tr* [ and then it begins to decrease 'after attributed ;;. day dissorution' time. This may be to the fact that after certain oissotution time a ,rrrirt"g. occur resistant to dissolution mav be formed which inhibitlrr" arr*rrrr* il;H.,ltt"s. observed that an average value of (493.09) cm2lsec may be considered as Olfnrsilriiv of urea through solid bentonite. From wrrrcL it muy u.'o;;..u; ;;;;;;;; varue or (704.80) cm2/sec rray be considered can be artributed to fact that.c^o aatinirgir 'rrai"yiteyi -o#f" r,rre.ua. ttth,aror ugh sorid phosphogypsum. This degradation is tbrrned by the characteristics of .u.t., material.