Iki gitabo cyuzuye gishakisha ingano ya Topsoil igikamyo cyo guta gishobora gutwara, gusesengura ubwoko butandukanye bwikamyo, imibumbe nuburemere bwibihingwa, hamwe ninama zifatika. Nibyiza kuba rwiyemezamirimo, birasobanura uburyo ubusumbato bwikamyo, kandi amategeko yikamyo bigira ingaruka kubushobozi bwo gukora, utanga inama zisobanutse zo gukora neza n'umutekano mu gutwara Tofical.
