PEDROZA, J. P.; http://lattes.cnpq.br/0132803130562466; PEDROZA, Juarez Paz.
Resumo:
Through two experiments taken in vegetation house condition at Centro
Nacional de Pesquisa do Algodão - EMBRAPA/CNPA ( National Center for Research
on Cotton) increasing doses effects were studied, which were 0, 60, 100, 200, 250, and
350 kg.ha-' for the fírst experiment, and 0, 150, 250, 350, 450, and 550 kg.ha-' for the
second experiment, of sewage sludge limided ( at 50%ST - biosolid), on the growth (
plant hight and stalk diameter), on the development ( fírst flowerbud and fírst cotton
capsule), on a production ( production o f stone cotton, weight o f 1 capsule, number of
capsules, percentage of fibre, plumage weight, weight of 100 seeds, aerial part
phitomass, root phitomass, and relation phitomass of aerial part/root phitomass) of a
cotton plant, on the physical features of the plumage (how thin, resistence, lengh, lengh
uniformity, short fibre rate, stretching, spiness, reflectingness, and yellow degree) and
finally on the edaphic environment: chemical features, ( contents of N , P, K, Ca, Mg,
organic matter and pH) and physic features ( real density, global density, total
porousness, field capacity, permanent wither point, and capacity for water storage) from
a typical ground in the region ( Regolitic Neosoil ). Besides ali those, parasitologic
analyses have been done with the aim to detect helmint eggs in stored water of each
experimental unit. Herbaceous cotton plant, variety BRS 187 8H has been choosen as
test plant. The experimental design used, for both experiments, was in casual blocks,
wich 6 treatments and 5 replications, in a total of 30 experimental units for each case.
Each experimental unit to establish vase plastic of 90 dm3 . The limimg eliminated the
pathogens organisms of the sludge and, according to estimated results obtained by
models of linear and non-linear regression, we could come into the conclusion that the
cotton plant represented by the crop BRS 187 8H, responded in a favorable way to the
biosolid aplication, as long as this waste can be added to the soil in proper doses, since
from the equivalent dose to 450kgNha-', there has been some decreasings in ali varieties
studied. The averall analyses of studied varieties allow to affirm that the best results, in
terms of growth, production and fibre technologic quality were obtained with the
equivalent biosolid dose of 300 kgN.ha-' . The biosolid doses increased linearly the
contents of N, P, K, Ca, Mg, organic matter and indice Ph, as well as the total
porousness, field capacity and permanent soil wither point. Helmint eggs presence in
stored water for each experimental unit hasn't been noticed.