The cassava crop: the effects of soil correction on its agronomic characteristics, distributed at different times

Abstract

The state of Pará is the main producer of cassava roots in Brazil, where its cultivation is mainly carried out by small producers, although the state has higher productivity compared to other producing states, its low productive efficiency is linked to factors, mainly to the management and low fertility of the soils used for growing cassava. In order to evaluate the agronomic characteristics of the table cassava culture (Manihot esculenta crantz), submitted to the application of dolomitic limestone at different times. An experiment under field conditions was installed at the Federal Rural University of Amazonia, in the municipality of Belém-Pará. The buttery yellow variety was used. The experimental delineation adopted was in blocks at random, with 5 treatments and 5 repetitions, the treatments consisted of application of limestone at different times and doses in the planting area, the experimental units were composed of plots with dimensions of 1,8 wide and 6 m long spaced in 0,90 m between lines and 1.0 m between plants, totalling 12 plants per sample unit. The treatments appeared of application of limestone in two seasons before and at the time of planting: T1 without silage; T2 heating 30 days before planting with application of limestone 1,644 kg ha-1, T3 heating at planting with application of limestone 1,644 kg ha-1; T4 application of limestone 1,644 kg ha-1 + 20% at planting; T5 application of limestone 1,644 kg ha-1 + 60% ha-1 at planting. At 180 days after planting (DAP), the collection was carried out for the collection of phytometric data, using 2 (two) central plants within each plot for the evaluation of fresh mass of the aerial part: number of leaves; Fresh leaf dough. For the determination of dry matter, root, stem and leaf were used. It was found that for most variables analyzed at 180 DAP, they did not obtain significant responses to the Turkey test at 0.05 significance, for most characters such as: plant height, stem diameter, number of leaves, weight of fresh leaf mass, number of total roots, root length. Presented statistical difference except for the character weight fresh stem mass, number of commercial root, commercial root weight, total root weight, dry leaf mass, dry stem mass, dry total root mass.