Efectos de labranza y forma de aplicacion de fertilizantes sobre rendimientos del sorgo (Sorghum bicolor L. Moench).
1995
Lugo J. | Rodriguez N.
The present research was made in alfisol, using for genetic material the hybrid Prosorgo I. The main objective was to evaluate the combined effects of four (4) tillage practices (mouldboard plough, chisel plough, heavy disc and minimum + bands) on soil physical properties, distribution and absortion of phosphorus and potassium, and their incidence in the Sorghum crop (Sorghum bicolor L. Moench). Variables were evaluated 30, 60 y 100 days after planting. These were porosity, humidity, mechanical resistance, phosphorus and potassium in soil, plant height, dry root weight, dry mater production, weeds, accumulation of phosphorus and potassium in plant and grain harvest. A complete randomized design was used with an array in bands and the data was processed in a S.A.S. Statistical program for U.C.V. Agronomy Faculty. Tillage practice increased total porosity and reduced the mechanical resistance of the soil in the tillage zone. Fertilizing application methods affected phosphorus (P) content in soil in the first 10 cm of depth, the results obtained were: Forescast (23 ppm), forecast + band (14 ppm) and band (9,75 ppm). The highest potassium (K) concentation in the superficial layer (0-10 cm) was found under minimum tillage conditions (95 ppm) and the lowest concentration in the mouldboard plough (42 ppm). There were not found, tillage practices and methods of application, significant effects on the P y K contents in plant and grain harvest. Plant P and K contents were found to be within the sufficiency range established for the crop, which are 0,15 to 0,25 % and 1 to 1,5% for P y K, respectively. The productions found were: Chisel plough (6,2) mouldboard plough (6,3), minimum tillage and heavy disc (6,2 Mg/ha) respectively.
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