The "TSP" is a trailed sieving harvester with box platform for harvesting sweet potatoes and other sensitive root crops. The machine is characterised by its high crop protection. The intake can be equipped with a share blade and coulter discs. Loose soil is sieved off on the first main web, so that only the harvested crop and some trash are transferred onto the picking web. Shortly before the transfer onto the picking web, the crop flow is evenly distributed by two distribution rollers. Between the two picking webs there is a crop conveying belt. "Positive picking" is characterised by the fact that the picking personnel remove the crop and not the impurities/the trash from the product flow. The trash is deposited back onto the field at the end of the picking web, whereas the harvested crop, which is picked-off and moved onto the centre crop conveying belt, is placed in a box. There is no need to use mechanical separators, which prevents damage to the crop. To increase crop protection on the whole process of conveying, the crate can be tilted, so that drop steps are minimised.