SURVEY OF TRACE ELEMENTS IN SOILS OF SIND PROVINCE AND THEIR EFFECTIVENESS ON THE PRODUCTIVITY OF WHEAT & RICE

Abstract

Soil sampl.es were collected f'r-om Tharparker, Nawabshah, Hyderabad, Dadu, Larkana, Sangher and . Khuirpur districtso Physical and chemical propertios of these s?mplos were det0rmined. Analysis of trace elements Li.ke. Zinc, Copper and Boron in soil samples were also carried outo Experiments were conducted to study the effects of Boron, Zinc and Copper on the growth and yield of wheat ?nd rice plantso · Zinc promoted the growth as compared to the control but increasing concentr?tion.o did not hnve any effecto In other pot oxporiments the effect of Zinc on growth of wheat plants in sandy lo;:-im and silty clay soils was also investigntedo Zinc suppliod in small amount as chelate (Zn EJYCA) to plants growing in snndy loam, subst8ntially increased the yield similar - . to that obtained by lar?c amount suppliod as sulphate. The addition of Zinc as che lato and as sulphate to silt:v clay soil nt highrr cone (10 lbs/acre ?inc QOd 5 lbs/ncro Zn EDTA) significantly suppressed tho yicldo Folinr appl?cation of Zn ns chelate (5 lbs/aero) to pl2nts grown in sundy loam and silty. clay significnntly Lnc.r o aaod the dry matter yield. In field expo r-Lme nts '.6inc and Boron applied through the soil significantly promoted the growth of rice plants. Pot expoz-Lmerrt s were also carried out to evaluate the effectiveness of different concentrr-at i.ors of coppor by soil and folinr troutmonts ..on the r;rowth and yi-ld of wheat i ?lants. The amount of copper in the plants was nlso 'i I -2- dctermin,:d. Effect of boron cone .ntrr .:.tion on the yield wore studied in tho same manner. \lhcn Boron was supplied to th0 clny soil singly or in combination with other trricc c Lorno rrt s , ? mnrkcd reduction of dry matter and grnin yio Ld ·1.r1:-1.s ob scr-vod , Tho effect of different concentration of boron on the yL)ld of whc at plants wero c ar-r-i.cd out under field conditions. Progressive effects were obs?r? din the c?sc of incronsin3 boron conc0ntr8tions used except the highest (10 lbs/ncr0), which neutralized the promotive effect. Tho fresh weight, dry weight 3Ild gr?in yields of wheat plnnt responded significflntly to diff?rent amount of· boron ond copper.