oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 6 )

2019 ( 781 )

2018 ( 1004 )

2017 ( 954 )

Custom range...

Search Results: 1 - 10 of 599714 matches for " C.A. Rosolem "
All listed articles are free for downloading (OA Articles)
Page 1 /599714
Display every page Item
Acumula??o de matéria seca e macronutrientes pelo sorgo sacarino
Rosolem, C.A.;Malavolta, E.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1981, DOI: 10.1590/S0071-12761981000100018
Abstract: samples of two varieties of sweet .sorghum (brandes and rio) grown on a dark red latosol (barra bonita, sp) were collected and analysed (dry matter and macronutrient contents) at intervals of 20 days. both varieties showed faster uptake of most of the nutrients between flower initiation and head formation. variety brandes, in said period, took up more nutrients per day than the other, although its cycle was longer.
Exigências nutricionais do sorgo sacarino
Rosolem, C.A.;Malavolta, E.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1981, DOI: 10.1590/S0071-12761981000100020
Abstract: the mineral requirements of two sorghum cultivars, brandes and rio, were studied both under field and greenhouse conditions. in the greenhouse plants received full strength hoagland's solution, whereas in the field a uniform fertilization of 150 kg n/ha, 200 kg p2o5 and kg k20 was used. under greenhouse conditions the need for nutrients obeyed the following decreasing order: k, n, ca, mg, p, s, fe, mh;, cu and zn. export of nutrients in the grains, in percentage of total uptake was as follows, respectively for brandes and rio: n - 55 and 59, p - 41 and 43, k - 68 and 72, ca - 16 and 10, mg - 47 and 44, s - 47 and 60, cu - 55 and 66, fe-6 and 7, mn - 10. and 8, zn - 14 and 10. date obtained with field grown plants plants showed that production of 1 ton of stalk required: 3.22 - 3.93 kg n, 0.40 - 0.45 p, 3.91 - 4.39 k, 1.09 - 0.77 ca, 0.86 - 0.54 mg, 0.32 - 0.41 s, 63 - 37 g fe, 3-5 - 3.0 g cu, 16 - 18 g mn , 8-9 g zn and 18 - 21 g b.
Capacidade de absor??o de nutrientes e eficiência nutricional do sorgo sacarino
Rosolem, C.A.;Malavolta, E.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1981, DOI: 10.1590/S0071-12761981000100017
Abstract: two sweet sorghum varieties, brandes and rio, were grown in full strenght and diluted nutrient solutions till completing the life cycle wherein mineral analyses were carried out. as a rule both varieties showed the same capacity to absorb nutrients in the two rates supplied. dry matter yield, however was different in the dilute nutrient solution. the variety brandes produced more fresh stalks in the full strength solution than rio; under nutricional stress the yield was lower. dry matter of stalks in the case of the variety rio was consistently higher.
Crescimento radicular e nutri??o mineral da soja em fun??o da calagem e aduba??o fosfatada
ROSOLEM, C.A.;MARCELLO, C.S.;
Scientia Agricola , 1998, DOI: 10.1590/S0103-90161998000300013
Abstract: calcium and phosphorus play important roles in plant root growth. a greenhouse experiment was carried out to study the effect of three levels of ca and four levels of p on soybean root growth, dry matter production and mineral nutrition. two soybean plants cv. iac 17 were grown for 35 days in 7 l pots containing a dark red latosol (acrortox, sandy loam). lime was applied in amounts calculated to raise the soil base saturation to 45, 50 and 75%. phosphorus was applied at 25, 50, 100 and 200 mg kg-1, using a ca free compound. a calcium content of 8.5 mmol(c) dm-3 in the soil allowed for a normal growth of soybean roots. when the soil base saturation was low (46%), the low availability of p led to an increase in root length and surface, without a corresponding increase in root dry matter. although these thin, long roots have an adequate geometry for p absorption, when the soil p contents were lower than 45 mg kg-1 this adjustment was not enough to maintain soybean p absorption at an adequate rate for plant growth.
Crescimento radicular e nutri o mineral da soja em fun o da calagem e aduba o fosfatada
ROSOLEM C.A.,MARCELLO C.S.
Scientia Agricola , 1998,
Abstract: Tanto o cálcio como o fósforo tem importante a o no crescimento de raízes. No presente trabalho foi estudado, em vasos, o efeito de tres níveis de Ca e quatro níveis de P no crescimento radicular, produ o de matéria seca e nutri o de plantas de soja cv. IAC 17. Duas plantas foram cultivadas em cada vaso de 7 L, preenchidos com terra proveniente de um Latossolo Vermelho Escuro de textura média, por 35 dias. Foi efetuada calagem calculada para se atingir satura es do solo por bases de 45, 50 e 75 %. As doses de P foram 25, 50, 100 e 200 mg kg-1, utilizando-se de fonte de P isenta de Ca. O teor de 8,5 mmol(c) dm-3 de Ca no solo foi suficiente para o crescimento normal do sistema radicular da soja. A baixa disponibilidade de P, em satura o do solo por bases de 46%, induziu ao crescimento das raízes em comprimento e superfície, sem modificar a massa de matéria seca das raízes. Embora raízes finas e longas tenham geometria favorável à absor o de P, em parcelas com teores menores que 45 mg kg-1, este ajuste n o é suficiente para manter a mesma absor o que é observada em parcelas com maior disponibilidade do nutriente.
Estudos sobre a nutri??o mineral do sorgo granífero, VII - efeitos do nitrogênio
Rosolem, C.A.;Malavolta, E.;Nakagawa, J.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1980, DOI: 10.1590/S0071-12761980000100004
Abstract: an experiment in nutrient solution was carried out to study the effects of increasing levels of n on growth, yield and mineral composition of 5 cultivars of grain sorghum namely: te y 101, c 101, c 102, p 8417, and e 57. four levels of n were used, all of them being a fraction of the concentration given in the solution of hoagland & arnon (1950) no 1. differential responses in dry matter, yield and n, p and k contents were observed and discussed.
Estudos sobre a nutri??o mineral do sorgo granífero: VIII. efeitos do fósforo
Rosolem, C.A.;Malavolta, E.;Brinholi, O.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1980, DOI: 10.1590/S0071-12761980000100005
Abstract: a greenhouse experiment with nutrient solution was carried out to verify the effects of phosphorus levels on growth, yield and nitrogen, phosphorus, and potassium contents of 5 grain sorghum cultivars. the plants were grown in 20 1 pots in presence either of full stregth solution, or phosphorus diluted to 0.5, 0.2 and 0.1 of normal concentration, and were harvested at maturity (110 days after germination). at harvest, the plants were split into several parts, oven dried and ground. the samples were then analysed for total nitrogen, phosphorus and potassium. decreasing phosphorus availability caused a cecrease in grain production, although the dry weight of the other plant parts was not affected; sorghum cultivars showed different responses to phosphorus. the levels of phosphorus in nutrient solution had an effect on nitrogen and phosphorus contents, but potassium absorption was not afected. a decrease in translocation of potassium to the sorghum grains with the decrease in phosphorus availability was observed.
Acumula??o de micronutrientes pelo sorgo sacarino
Rosolem, C.A.;Malavolta, E.;Machado, J. R.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1981, DOI: 10.1590/S0071-12761981000100019
Abstract: samples of two cultivars of sweet sorghum (brandes and rio) grown on a dark red latosol (latossolo roxo, barra bonita, sp.) were collected at intervals of 20 days during their life cycle and the contents of micronutrients were determined by routine procedures. usually the physiological stages in which the rate of absorption was higher were not the same for both varieties.
Estudos sobre a nutri??o mineral do sorgo granífero: IX - efeitos do potássio
Rosolem, C.A.;Malavolta, E.;Machado, J.R.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1980, DOI: 10.1590/S0071-12761980000100010
Abstract: a greenhouse experiment was carried out to verify the effects of potassium on growth, yield and nitrogen, phosphorus and potassium absorption of 5 grain sorghum cultivars. sorghum plants were grown in 20 1 pots, in presence either of full strengh solution, or potassium diluted to 0.5, 0.2 and 0.1 of normal concentration. at harvest (110 days from germination) the plants were split into several parts, oven dried, and ground. the samples were then analysed for total nitrogen, phosphorus and potassium. the potassium levels in nutrient solution afected the dry weight of sorghum grains; effects onthe dry weight of the other plant parts were not observed. the absorption of nitrogen, phosphorus and potassium decreased with the decrease in potassium supply; but only the nitrogen translocation to grains was afected by potassium levels in nutrient solution.
Crescimento inicial da soja sob efeito de resíduos de sorgo
Olibone, D.;Calonego, J.C.;Pavinato, P.S.;Rosolem, C.A.;
Planta Daninha , 2006, DOI: 10.1590/S0100-83582006000200007
Abstract: this experiment was carried out in a greenhouse at faculdade de ciências agron?micas unesp, botucatu, s?o paulo, to evaluate early growth and root system formation of soybean in the presence of guinea and forage sorghum crop residues. the experimental units consisted of pvc tubes (rhizotron) with the capacity of 16 dm-3 of soil. the experimental design was a 2 x 3 factorial in complete randomized blocks, with four replicates. guinea sorghum straw left on the soil surface reduced soil base saturation. residues of both sorghum varieties left on the soil surface reduced soybean growth. this was also observed in the presence of forage sorghum root system, alone. guinea sorghum residues, mainly the straw left on the soil surface, decreased soybean nutrient accumulation as well as root and shoot growth.
Page 1 /599714
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.