This paper describes a new machine for cleaning coffee harvested with plastic nets, as well as the coupling of this machine to the horizontal washer. The machine consists of two blowers in two tunnel chambers. The material fed by a screw conveyor is taken by a rotating shaft and ejected by the action of the blower in the upper chamber. The separated material (coffee beans, berries, dirt and small twigs) which falls through the screen to the bottom chamber is carried by a water stream into the washing reel. Further separation of the above mentioned material is accomplished by the washer, the shaker screen, and the flotation tank. This machine, together with the washing reel, is capable of processing coffee from 4.3 acres in an 8-hour run with the screw conveyor set at a speed of 30 rpm. Reduction of the speed to 20 rpm also reduces the output to that of 1.9 acres in an 8-hour run.
Onion cultivars Granex 33, Granex 429, Texas Grano 502, Texas Grano 1025 Y, Texas Grano 1105 Y, FMX-225, Texas Grano 1030 Y, Texas Early Grano 502 and Texas Grano 1015 Y were evaluated at the Fortuna Agricultural Experiment Substation in Juana Díaz, P, R. from late November 1985 to early April 1986. Granex 33 and Granex 429 gave highest marketable yields: 33,075 and 32,194 kg/ha, respectively. These yields were significantly higher than yields of other cultivars except Texas Grano 502. These cultivars were also the best in terms of size classification. There were no significant differences in average bulb weight among most of the cultivars. Granex 33 had the highest density and Texas Grano 1030 Y had the highest percentage of total solids.
Sweet peppers (var. Cubanelle) graded for width, length and weight were evaluated after three fertigation treatments (T1 = 150, T2 = 300 and T3 = 500 Kg of N/ha), 500 Kg of N/ha side-dressed (T4), no fertilizer (T5), plastic mulching (P) and no mulching (NP). Nitrogen source was urea. The relationships of average width and average weight versus days after transplanting were sigmoidal. A linear relationship was found between average length versus days after transplanting. More than 50% of peppers were within size classes 1 to 4 ; fewer than 40% were in the size classes 5 to 9. During the growing cycle, mean numbers of peppers and weight per pepper in each size class were not statistically different (P = 0.05) among main treatments (T1, T2, T3, T4, T5). In size classes 1 to 9, there were significantly more peppers (P = 0.05) in P plots than in NP plots. Fruit parameter values decreased with successive picking and were significantly lower (P = 0.05) in the 5th picking and were higher in the P plots than in the NP plots (P = 0.05). Fertilization and fertigation resulted in higher values than non-fertilization.
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