Cleiton José Ramão

Propriedades físicas do solo e produtividade de arroz irrigado por inundação no sistema plantio direto

O objetivo deste trabalho foi avaliar as propriedades fisicas do solo e a produtividade de arroz irrigado por inundacao no sistema plantio direto, na fronteira oeste do Rio Grande do Sul, em comparacao ao sistema convencional. Utilizou-se o delineamento experimental inteiramente casualizado, com tres experimentos e dez repeticoes: E1, sistema plantio direto apos nivelamento do terreno (E1PDR) e sistema convencional com duas gradagens a 0,0-0,07 m apos nivelamento do terreno (E1C), sete anos de pousio do cultivo de arroz, com semeadura de azevem no inverno e pastejo animal; E2, sistema plantio direto (E2PD) e sistema convencional (E2C), apos campo nativo; E3, sistema plantio direto (E3PD), sistema plantio direto apos nivelamento do terreno com remaplan (E3PDR) e sistema convencional (E3C), apos arroz irrigado em sistema convencional, durante um ano sob campo nativo. As propriedades fisicas do solo diferiram pouco entre os sistemas de plantio direto e o sistema convencional. O cultivo continuado com arroz irrigado causou compactacao do solo na camada 0,07-0,10 m. A produtividade de arroz nao diferiu nos sistemas plantio direto e convencional, nos experimentos 1 e 2. No experimento 3, com maior quantidade de restos culturais de arroz, a produtividade foi superior no sistema convencional

Níveis de irrigação na cultura do Kalanchoe cultivado em ambiente protegido

The research about the leaf development is very important to evaluate the plants growth and development. The objective of this research was to verify the different level consequences about the irrigation water manner in the leaf growth and the number of the Kalanchoe leaves. The experimental search used was completely randomized, with eight treatments, they consisted in 15; 13; 11; 9; 8; 6; 4 e 2mm irrigation in ten repetitions. The plants leaf area was calculated by the area of each leaf, multiplied by the coefficient of 1.1134. The results showed that the irrigation length between 6 and 9mm showed a bigger leaf growth and more leaves in each plant; the biggest technical efficiency was found with 6.68 and 8.59mm length, to each leaf area and the leaves number in leaf/plant, respectively. In a water condition deficit the Kalanchoe reduces a lot the leaf transversal growth related to the longitudinal.

Propriedades físicas do solo e produtividade de arroz irrigado em diferentes sistemas de manejo

The State of Rio Grande do Sul is the greatest producer of flooded rice of Brazil, concentrated mostly along the western border. The objective was to evaluate soil physical properties and flooded rice yield in no-till and conventional tillage systems and rice straw levels in no-till system. The study consisted of four experiments (E), laid out in experimental design was completely randomized blocks, with four experiments (E) and 10 repetitions in experiment 1, 2 and 3 and 6 in experiment 4. The management system in E1 consisted of no-till (E1PD) and conventional tillage with two harrowings (layer 0.0-0.07) m after levelling (E1C), on soil where rice had been gown for one year followed by seven years of fallow, with rye grass sowing in the winter and grazing all year long; E2: no-till (E2PD) and conventional tillage (E2C), after native grassland; E3: no-till (E3PD) and conventional tillage (E3C) after no-tillage rice for two years on a native grassland area; E4: four rice straw levels had been used before rice sowing. The yield of flooded rice did not differ between no-till and conventional tillage. The residual dry mass of rice before sowing did not influence the flooded rice yield.