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.
Highlights
Upland rice (Oryza sativa L.), known as aerobic rice, grows generally on undulating lands and depends totally on rainfall for water supply
Most of the soils of the region are Oxisols and Ultisols, presenting low fertility (Lopes, 1983; Goedert, 1989); Zn deficiency in upland rice grown on these soils is widely reported (Fageria et al, 1997; Fageria, 2001)
The first four plant parameters did not show significant interactions between Zn and genotypes (ZnxG). Results related to these parameters are presented across the two soil Zn levels
Summary
Upland rice (Oryza sativa L.), known as aerobic rice, grows generally on undulating lands and depends totally on rainfall for water supply. This crop is mainly grown in the central part of Brazil, which is locally known as the “Cerrado” region. Most of the soils of the region are Oxisols and Ultisols, presenting low fertility (Lopes, 1983; Goedert, 1989); Zn deficiency in upland rice grown on these soils is widely reported (Fageria et al, 1997; Fageria, 2001). The main reason for deficiency in highly weathered acidic Cerrado soils is that these soils are inherently low in total and available Zn. liming is an essential practice to reduce soil acidity and to improve crop yield on these soils. Increased soil pH due to liming tends to increase Zn deficiency in crop plants (Fageria et al, 2002)
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