Growth components and zinc recovery efficiency of upland rice genotypes

Abstract

-The objective of this work was to evaluate Zn use efficiency by upland rice genotypes. The experiment was carried out in a greenhouse, with ten upland rice genotypes grown on an Oxisol (Typic Hapludox) with no application, and with application of 10 mg kg -1 Zn, applied as zinc sulfate. Shoot dry weight, grain yield, Zn harvest index, Zn concentration in shoot and in grain were significantly influenced by soil Zn levels and genotypes. However, panicle number and grain harvest index were significantly affected only by genotype. Genotypes CNA8557, CNA8540 and IR42 produced higher grain yield than other genotypes. Genotypes showed significant variability in Zn recovery efficiency. On average, 13% of the applied Zn was recovered by upland rice genotypes. Genotypes with high Zn recovery efficiency could be used in breeding of Zn efficient upland rice cultivars. Higher level of soil Zn (10 mg kg -1 ) increased significantly the concentrations of plant Cu and Mn. However, Fe concentrations in plant (shoot and grain) were not influenced by soil Zn levels.

Nutritionally Enhanced Staple Food Crops

“…The HI Zn in the tested rice cultivars decreased considerably with increasing total plant Zn content probably due to concentration effect (opposite of dilution). These results are consistent with those reported earlier for wheat (Herren and Feller 1994) and rice (Fageria and Baligar 2005). Furthermore, Jiang et al (2008) demonstrated that due to physiological regulation and barriers in the rice plant, it is difficult to enhance Zn concentration in brown rice by simply increasing Zn supply in the soil or growing medium.…”

Zinc fertilization effects on agromorphological and quality parameters of commonly grown rice

“…So, from the results it can be opined that soil plus foliar application of Zn is conducive for increasing the panicle length. These results are in line with Bandara and Silva (2000) who reported an increase of 7% panicle length upon application of 2.5 kg Zn ha -1 , while Fageria and Baligar (2005) showed significant genotypic variations among the rice genotypes upon application of Zn fertilizers as well as without Zn application. Results also showed that among the different categories of the cultivars Zn application was very effective in case of hybrid followed by aromatic, local and HYV.…”

“…carbonic anhydrase and a number of dehydrogenases (Vallee and Wacker, 1970). Increased grain yield of 16.5% upon application of 2.5 kg Zn ha -1 was reported by Bandara and Silva (2000) while 15% increase in grain yield upon application of 5 kg Zn ha -1 was reported by Rahman et al (2008); a significant increase in grain yield upon Zn fertilization and its variations among the upland rice cultivars was also reported by Fageria and Baligar (2005).…”

Tratamento de sementes de trigo com zinco: armazenabilidade, componentes do rendimento e teor do elemento nas sementes

“…O experimento foi conduzido em blocos ao acaso, em quatro repetições e os dados foram submetidos à análise de variância e regressão polinomial ao nível de 5% de probabilidade, com auxílio do programa estatístico Sisvar (FERREIRA, 2000).…”