Performance of rice seeds treated with zinc, boron, and molybdenum

Abstract

-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.Index terms: Oryza sativa, initial growth, physiological quality, growth rate.Desempenho de sementes de arroz tratadas com zinco, boro e molibdênio RESUMO -O objetivo deste estudo foi avaliar a qualidade fisiológica das sementes e o crescimento inicial das plântulas de arroz irrigado, cultivar PUITA-INTA CL, tratadas com um produto a base de zinco, boro e molibdênio. Foram testadas as seguintes doses do produto: 0 (testemunha), 50, 100, 150 e 200 mL.100 kg -1 de sementes. Foi utilizado o delineamento experimental inteiramente casualizado, com 10 tratamentos e quatro repetições. A qualidade fisiológica das sementes foi avaliada pelos seguintes testes: germinação; primeira contagem de germinação; e comprimento e fitomassa seca de plântulas. O crescimento inicial foi avaliado aos 7, 14, 21, 28, 35 e 42 dias após a emergência (DAE) pela altura de planta, área foliar e fitomassa seca de parte aérea e raiz. Concluiu-se que o tratamento de sementes de arroz irrigado com o composto contendo zinco, boro e molibdênio, até a dose estudada de 200 mL.100 kg -1 de semente, não influencia germinação, primeira contagem da germinação, fitomassa seca de parte aérea e raiz; entretanto influencia negativamente o comprimento das plântulas. Além disso, também promove maior altura de planta, maior área foliar, maior produção de fitomassa seca de planta e aumento da taxa de crescimento, até os 42 DAE.Termos para indexação: Oryza sativa, crescimento inicial, qualidade fisiológica, taxa de crescimento.

Physiological potential of Stylosanthes spp. seeds cv. Campo Grande in response to coating with zinc and boron

“…Results that corroborate the observed in this work were found by several authors for the SL and RL, but with other species, is seed coating with Zn and B combined or in the use of these isolated way (Ohse et al, 2000;Funguetto, 2007;Masuthi et al, 2009;Tavares et al, 2013a;Tavares et al, 2013). However, Ohse et al (2000) achieved better results for zinc applied separately and negative for the shoot, root and whole plant length of rice when the seeds were given in B + Zn coating together.…”

“…None of the treatments proved superior to the seed not covered, especially on treatment 6 (addition of 200 g of boric acid and zinc sulfate 150 g.kg -1 of seeds) in which the scored percentage of germination in the first test was equal to zero. Some authors, in contrast, didn't check effect of zinc and boron coating on FGC of rice and wheat seeds (Tavares et al, 2013a;Tavares et al, 2013b 0.73 and 0.03 g.kg -1 of Zn and B for wheat, respectively) used in rice and wheat seeds were much smaller when compared to those employed in this work. Probably the reduction observed in the FGC is associated with osmotic effect provided by micronutrients.…”

“…However, several authors report that the seed coating with these micronutrients either applied alone or in combination, does not affect the germination (Ohse et al, 2000;Masuthi et al, 2009;Tavares et al, 2013a;Tavares et al, 2013b;Tavares et al, 2013c;Arjmand et al, 2014;Oliveira et al, 2014). However, it is noteworthy that the species used in this study differs from the species evaluated by the authors mentioned and the doses of micronutrients were employed higher than those used for the same.…”

“…Tavares et al (2013a) also observed increments in LA of rice plants obtained from seeds coated with Zn and B as the doses tested increased (maximum dose tested of 0.25 g Zn.kg -1 of seeds and 8.4 g B.kg -1 of seeds). The authors evaluated two products, one of which was composed only for Zn and the other by mixing this with B and Mo, and there have been no difference between the same.…”

Performance of Soybean Seedlings Upon Nutrient Application by Seed Coating

“…In relation to the comparison between two cultivars, it is a common approach in experiments that evaluate the performance of seeds subjected to a treatment with nutrients. Several surveys have been conducted in this way, assessing several varieties and their responses to the application of nutrients -such as the works by Tavares et al with barley seeds 43 and rice 44 , the one by Ohse, Cubis 45 with wheat seeds or that by Queiroga, de Queiroz Castro 46 with cotton seeds, to name a fewand significant differences between cultivars were also found, as in the study reported herein.…”