Tolerância de variedades de cana-de-açúcar (Saccarum officinarum L.) cultivadas em solo compactado.

Abstract

Sugarcane (Saccharum officinarum L) is cultivated throughout the Brazilian territory, due to the edaphic and climatic conditions favorable to its cultivation. The objective of the work was to verify the initial growth of different sugar cane genotypes in a compacted soil with different density to be made for root growth evaluations, from the air portion of the plant, the quantity of leaves present and weights pertaining to the dry mass of the plant's vegetative organs and the total dry mass. The work was conducted at home of vegetation in the center of Agrarian Sciences, Campus II of UFPB in the municipality of Sand, at coordinates 06 ° 57 ' 48 "s and 35 ° 41 ' 30" W and 623 m altitude. The soil used in this work is classified as Argissolo yellow red. The experimental design was used entirely randomized design, with four varieties of sugar cane in three different compression levels, considering as experimental Unit 3 plants. The treatments used were with different soil densities with respectively: 1 mg m-³; 1, 4, 4 m ³ and 1, 7Mg m³ of soil by compression ring. Evaluated at 7,15 and 30 days after the transplantation of the mini-toletes the diameter of the stem, height of the plants and quantity of sheets present in each plant, statistical analyses of the variables were made, plant height; Dry mass of the root, dry mass of the aerial part; Total dry mass and root ratio aerial part. It was observed with the results that the higher the density of the soil, smaller will be the growth capacity of the culture, as well as that a soil with high level of compression decreases the dried mass of the root, as it observed in the RB7515 variety when compared to compression levels 1, 0Mg m-3 and 1, 7Mg m-3.