This experiment was carried out in two seasons ( 2007/2008 & 2008/2009) at a private mango farm near Almasimir of Abyan Governorate. The complete randomized design was used in five treatments: 1)Mouldboard Plow 2) Mouldboard Plow + cultivator 3) cultivator 4) herbicide ( Gloconal) and 5) farmer's method. Highest tree size was achieved in cultivator treatment (64.72 m3) in the 1st season, but in herbicides treatment in 2nd season (49.58 m3). For tree height in 1st season, Mouldboard Plow + cultivator and herbicide treatments were superior (50 cm). But, in 2nd season, herbicide treatment surpassed them (67.5 cm). For tree diameter along the line, herbicide was superior in 1st season (95 cm) and in 2nd season (60 cm). For diameter of tree across the line, best difference was recorded in Mouldboard Plow (47.5 cm) in 1st season, but in Mouldboard Plow + cultivator treatment (32.5 cm) in 2nd season. For number of fruit/ tree during 1st season, cultivator plowing treatment has achieved highest value as compared to 2nd season where cultivator had recorded largest value. Fruit weight in 1st season was higher in herbicide (245 gm). Economic evaluation showed that cultivator treatment gave higher economic return during 1st and 2nd season ( + 31%). Variable costs of treatments had proven that cultivator treatment was least cost ( - 38%), and herbicide treatment as high cost ( + 222%). Results have also shown that cultivator treatment was of the highest economic return and lower cost.
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