Abstract
The great expansion of sugar cane production to non-traditional regions in Brazil has demonstrated the importance of knowledge on the growth characteristics to maintain the productivity and sustainability of the sector. Among the alternatives available to evaluate different varieties of sugar cane, the growth analysis has been one of the most used tools. The objective of this study was to evaluate the growth and development of three varieties of sugar cane for the Pre-Amazon region of Brazil. The varieties used were RB 867515, RB 863129 and RB 92579, and the following parameters of growth were evaluated: accumulation of biomass on the part area, leaf area, number of plants, height of stems, the nitrogen content in different parts of the plant (stem and leaf+3), brix and productivity. For that, samples were collected at 60, 120, 180, 240 and 300 days after planting. For all collecting dates and at 300 days after planting the variety RB 863129 presented better results (P 0.05) for the varieties RB 863129 and RB 92579. Leaf area was greater (P<0.05) for the variety RB 867515; and nitrogen content of stems were greater for the variety RB 92579 at 300 days after planting. Overall, the RB 863129 variety was the most promising for cultivation in this region during the sugarcane-plant season. Key words: Biomass, crop development analysis, selection of varieties.
Highlights
Sugarcane cultivation is one of the main agricultural activities in Brazil and comprises the oldest agroindustrial sector, occupying a prominent position in the Brazilian national and international economy
For all collecting dates and at 300 days after planting the variety RB 863129 presented better results (P
In view of what has been exposed here, with the expectation of expanding the sector in regions of Brazil that are still untapped, that is, within the pre-Amazon region comprising the Low Parnaíba of Maranhão microregion, this study aimed to evaluate the growth and development of three sugarcane varieties (RB 867515, RB863129, RB92579) for the region's edaphoclimatic conditions
Summary
Sugarcane cultivation is one of the main agricultural activities in Brazil and comprises the oldest agroindustrial sector, occupying a prominent position in the Brazilian national and international economy. Among the alternatives available for studying sugarcane varieties, one of the most used tools has been growth analysis, which is considered a standard method for measuring crop biological productivity, serving as a very important tool to evaluate crop growth under different cultivation conditions (Batista et al, 2013). This method allows identification of the best crop developmental stages by evaluating morphological variables of the plants, such as height, stem diameter, tillering, leaf area, and yield, making it possible to determine the productive capacity of different varieties. Oliveira et al (2010), evaluating growth and accumulated dry matter in eleven sugarcane varieties (SP 791011, RB 813804, RB 863129, RB 872552, RB 943365, RB 72454, RB 763710, SP 784764, SP 813250, RB 867515, and RB 92579) farmed under full irrigation, found that accumulated stem dry matter was characterized by the following three developmental stages: a first stage characterized by lower accumulated stem dry weight than accumulated leaf+top dry weight (on average 8 Mg ha-1 at 120 days after planting - DAP); a second stage where accumulated stem dry weight was higher (on average 48 Mg ha-1 at 240 DAP); and a third stage starting at 240 DAP with higher accumulated stem dry weight (85 and 72 Mg ha-1) for the 92579 and SP81 3250 varieties, respectively
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