The present invention relates to a crystalline form of 2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1-(2H)pyrimidinyl]-4-fluoro-N-[[methyl(l-methylethyl)-amino]-sulfonyl]benzamide. The invention also relates to a process for the preparation of this crystalline form and to plant protection formulations which comprise this crystalline form of the phenyluracil.本發明係關於一種2-氯-5-[3,6-二氫-3-甲基-2,6-二酮基-4-(三氟甲基)-1-(2H)嘧啶基]-4-氟-N-[[甲基(1-甲基乙基)胺基]-磺醯基]苯甲醯胺之結晶型。本發明亦係關於一種用於製備該結晶型之方法及包含苯基尿嘧啶(phenyluracil)結晶型之植物保護調配物。