THE PHYSICO-CHEMICAL PARAMETERS OF BIOCHAR PRODUCED FROM THE STEMS OF DIFFERENT CROPS (RICE, MILLET AND SORGHUM) AND ITS INFLUENCE ON SELECTED HEAVY METALS IN LEAD CONTAMINATED SOIL AT A MINING AREA OF ZAMFARA STATE, NIGERIA
DETERMINATION OF HEAVY METALS AND IONS IN VEGETABLE SAMPLES FROM WAWAH AND YIMIR- DHALANG AGRICULTURAL AREAS, KWAYA KUSAR LOCAL GOVERNMENT, BORNO STATE