... 29.0 Potassium nitrate (KNO 3 ) 38 K 13 N 133 .3 133 .3 Magnesium sulphate (MgSO4) 9.8 Mg 13 S 58.1 58.1 Boric acid (H 3 BO 3 ) 17.7 B 0 .35 0 .35 Zinc sulphate (ZnSO4.7H2O) ... wide, 1 5-2 0cm in heigh, 2 5- 30 cm in gutter. Fertilizer: Amount of fertilizer for 1 ha growing cucumber (to get yield about 50tons/ha) - Cow dung: 3 5-4 0 tons - Urea (46%N): 30 0 -3 50kg - Supper ... Prepare land, fertilizer - Cucumber usually like pH 5, 5-6 ,8 (suitable of pH 6, 0-6 ,5). If the land is acid soil then could add more lime before cultivated. - The land were plough and clean...