Daniel Ândrei Robe Fonseca

Desempenho de sementes de arroz tratadas com zinco, boro e molibdênio

The objective of this study was to assess physiological quality of seeds and the initial growth of lowland rice seedlings, cv. PUITA INTA-CL, treated with a product based on Zinc, Boron and Molybdenum. The following dosages of product were used: 0 (control), 50, 100, 150 and 200 mL.100 kg-1 seed. A completely randomized experimental design was used, with 10 treatments and four replications. Physiological quality of seeds was assessed by following tests: germination; first count of germination; and length and dry phytomass of seedlings. The initial growth was assessed at 7, 14, 21, 35, and 42 days after emergence (DAE) through plant height, leaf area and dry phytomass of aerial parts and roots. It was concluded that the treatment of rice seeds with the product containing Zinc, Boron and Molybdenum up to the dosage tested of 200 mL.100 kg-1 seed does not influence germination, first count of germination, and the dry phytomass of aerial parts and roots; however, negatively influences seedling length. In addition, it also promotes greater plant height, higher leaf area, higher production of dry phytomass of seedlings, and increase on the growth rate, until 42 DAE.

Crescimento de plântulas de aveia branca submetidas ao estresse salino

The cultivation of white oat in succession to irrigated rice is considered a viable alternative, mainly because of their added value and for their restorative characteristics of the soil, though their productive potential can be reduced considerably because of the soil salinization, being very important to determine salt concentration tolerated by different white oat cultivars.The objective is to evaluate, oat cultivars recommended for the state of Rio Grande do Sul under different salt concentrations in seed germination and early growth. The experimental design was completely randomized factorial 2X5, with four replications, (cultivars Barbarasul and Chiarasul, salt concentration and levels 0, 25, 50, 75 and 100 mM NaCl per liter of water). The physiological seed quality was evaluated in the laboratory by germination, first count of germination, length of shoot and root dry weight of shoot and root. Based on the results we can conclude that: germination and seedling growth of oat cultivars and Barbarasul Chiarasul are 1 Eng°s Agros, Discente de Doutorado em Ciência e Tecnologia de Sementes, Universidade Federal de Pelotas UFPEL, Pelotas, RS. E-mail: beldar_brunes@msn.com; danielfonseca30@yahoo.com.br; lizandro_cicilianotavares@yahoo.com.br 2 Licenciado em Ciências Agrícolas, Discente de Doutorado em Ciência e Tecnologia de Sementes, UFPEL, Pelotas, RS. E-mail: cassyo.araujo@yahoo.com.br 3 Enga Agra, Profa Dra do Programa em Pós-Graduação em Ciência e Tecnologia de Sementes, UFPEL, Pelotas/RS. E-mail: lilianmtunes@yahoo.com.br 4 Prof. Dr. do Programa em Pós-Graduação em Ciência e Tecnologia de Sementes, UFPEL, Pelotas, RS. E-mail: francisco.villela@ ufpel.edu.br * Autor para correspondência