Enriching Rice Grain Zinc through Zinc Fertilization and Water Management Soil Fertility & Plant Nutrition (original) (raw)
Related papers
Journal of Plant Nutrition and Soil Science, 2018
Zinc (Zn) is an important micronutrient for rice (Oryza sativa L.) production and its deficiency has been observed in various production systems. High grain Zn concentration is equally important for high rice yield and human health. In this work, the effects of Zn fertilization on seedling growth, grain yield, grain Zn concentration, and their association with root traits were studied under alternate wetting and drying (AWD), aerobic rice (AR), system of rice intensification (SRI), and continuous flooding (CF). Zinc fertilization (15 kg ha-1) improved nursery seedlings chlorophyll and Zn concentrations, root length, and number of roots with highest values observed in CF. At harvesting, maximum plant height, panicle length, total and panicle bearing tillers, and kernel yield were found with Zn addition in AWD and CF rice systems. Mid season drainage provided at maximum tillering and Zn fertilization increased its concentration in leaves, culms, panicles, and grains under CF and AR at physiological maturity. Most of Zn applied was allocated into culms and panicles, nevertheless, a significant increase in grain Zn concentration was also observed in all production systems. Association of leaf Zn with grain Zn concentration was stronger than with culm and panicle Zn. The results indicate that Zn application after rice nursery transplanting is more important for grain Zn enrichment in all rice systems than for increase in grain yield in all systems except AWD where grain yield was also increased. More grain yield in CF and AWD as compared to SRI and AR can also be attributed to decreased spikelet sterility and to better Zn phyto-availability in these rice systems at physiological maturity.
Field Crops Research, 2019
Higher grain Zn concentration in 'biofortified' rice genotypes, bred for high grain Zn concentration, should not be at the expense of reduced grain yield. This study examined the grain yield and grain Zn concentration of Zn-biofortified genotypes in field experiments in the Philippines. Zinc-biofortified genotypes (high grain Zn concentration in Zn-sufficient soil) were compared with efficient genotypes (tolerant of soil Zn deficiency), inefficient genotypes (sensitive to soil Zn deficiency) and check genotypes (popular local varieties) at four sites (Bay, Bohol, Bukidnon and IRRI) with differing types and degrees of Zn deficiency, over five cropping seasons (wet season 2012, 2014 and 2015 and dry season 2013 and 2015). A common experimental design and plot size were used with treatments (genotypes and Zn fertilization) arranged in a two-factorial randomized complete block design. The results showed that biofortified genotypes achieved both the Philippine grain yield target (4.0 t ha-1) and grain Zn biofortification target (30 mg kg-1) only when grown under Zn-sufficient conditions. In Zndeficient soils, most Zn-biofortified and deficiency-tolerant genotypes reached the Zn concentration target but not the yield target, suggesting the need to correct the soil Zndeficiency to prevent yield penalty. Further, results from IRRI showed that only Zn-fertilized plants were able to achieve the Zn biofortification target during the wet season; whereas during the dry season, when the soil was less chemically-reduced and therefore the soil Zn probably more plant-available, grain Zn levels were all above the threshold, with or without Zn fertilizer. This suggests that Zn fertilization may not be needed during the dry season in soils with sufficient, potentially plant-available Zn.
Effect of low‐use‐rate zinc fertilization on rice growth and grain yield
Agrosystems, Geosciences & Environment
Low-use-rate Zn fertilization methods have been developed and marketed for rice (Oryza sativa L.) fertilization with limited research validating their efficacy. Our research objectives were to evaluate the effect of Zn-seed treatment rate combined with six Zn-fertilization methods on early season canopy coverage, tissue-Zn concentration at the mid-tillering stage, and rice grain yield. The field experiment was conducted on six silt loams and one clay. Rice seed was treated with 0 or 3.3 g Zn kg −1 as ZnO and combined with no Zn, granular ZnSO 4 applied at 11 kg Zn ha −1 (GRAN), 1.68 kg Zn ha −1 as MicroEssentials (MESZ), 1.1 kg Zn ha −1 as foliar-applied Zn-EDTA (EDTA), and 0.56 and 1.12 kg Zn ha −1 of WolfTrax Zn-DDP (DDP). Canopy coverage of seedling rice was measured at six sites and analyzed by site. Four sites were not affected by Zn-seed treatment rate or fertilization method. At two sites, canopy coverage was affected by Zn-fertilization method or the significant Zn-seed treatment rate and Zn-fertilization method interaction. Rice receiving MESZ had the greatest canopy coverage at these sites. When averaged across sites and Zn fertilization methods, seed treated with 3.3 g Zn kg −1 increased seedling tissue-Zn concentration and biomass by 1.6 mg Zn kg −1 and 48 kg ha −1 respectively. Rice receiving GRAN, increased tissue-Zn concentration by 7.6 mg Zn kg −1 above rice not receiving Zn (21.3 mg kg −1). Low-use-rate Zn fertilizers provide minimal Zn nutrition for rice seedlings and should be avoided on fields where Zn deficiencies are probable.
Effect of zinc fertilization on yield and grain zinc concentration of rice under field conditions
Research on Crops, 2018
Low-use-rate Zn fertilization methods have been developed and marketed for rice (Oryza sativa L.) fertilization with limited research validating their efficacy. Our research objectives were to evaluate the effect of Zn-seed treatment rate combined with six Zn-fertilization methods on early season canopy coverage, tissue-Zn concentration at the mid-tillering stage, and rice grain yield. The field experiment was conducted on six silt loams and one clay. Rice seed was treated with 0 or 3.3 g Zn kg −1 as ZnO and combined with no Zn, granular ZnSO 4 applied at 11 kg Zn ha −1 (GRAN), 1.68 kg Zn ha −1 as MicroEssentials (MESZ), 1.1 kg Zn ha −1 as foliar-applied Zn-EDTA (EDTA), and 0.56 and 1.12 kg Zn ha −1 of WolfTrax Zn-DDP (DDP). Canopy coverage of seedling rice was measured at six sites and analyzed by site. Four sites were not affected by Zn-seed treatment rate or fertilization method. At two sites, canopy coverage was affected by Zn-fertilization method or the significant Zn-seed treatment rate and Zn-fertilization method interaction. Rice receiving MESZ had the greatest canopy coverage at these sites. When averaged across sites and Zn fertilization methods, seed treated with 3.3 g Zn kg −1 increased seedling tissue-Zn concentration and biomass by 1.6 mg Zn kg −1 and 48 kg ha −1 respectively. Rice receiving GRAN, increased tissue-Zn concentration by 7.6 mg Zn kg −1 above rice not receiving Zn (21.3 mg kg −1). Low-use-rate Zn fertilizers provide minimal Zn nutrition for rice seedlings and should be avoided on fields where Zn deficiencies are probable.
Plant Science Today
One of the primary abiotic factors limiting rice production is zinc (Zn) deficiency. Effective management of Zn in rice soils is crucial, as rice is a staple crop for many nations. To address this issue, a pot trial was conducted at the net house of the Department of Agronomy, Bangladesh Agricultural University, Mymensingh,from December 2019 to May 2020. The trail aimed to assess the impact of zinc on yield performance and grain zinc content of rice. The experiment employed a completely randomized design (CRD) with three replications, involving the applications of six different rates of Zn to three distinct varieties of boro rice. The result revealed that BRRI dhan28 exhibited superior yield and yield-related traits when treated with 12 kg Zn ha-1. Meanwhile, the application of 10 kg Zn ha-1 resulted in the highest Zn content in the grain of BRRI dhan74, considering the quantity of Zn accumulated by the grain. Based on the findings of the study, it can be concluded that applying 12 ...
Journal of Pharmacognosy and Phytochemistry, 2018
A pot experiment was conducted in the experimental farm of Mountain Research Centre for Field Crops (MRCFC), Khudwani of Sher-e-Kashmir University of Agricultural Sciences & Technology of Kashmir. The experimental soil was slity clay loam, low in available N, medium in P and K and deficient in Zn with neutral pH, and was laid out in completely randomised design (CRD) with three replications to study the response of varying Zn concentrations (0, 5, 10, 15 and 20 mg Zn kg soil) in four rice genotypes (Jhelum, SR1, China 1007 and China1039). Genotypes differed significantly in grain yield.Among the genotypes SR1 gave significantly higher grain yield over Jhelum and both out yielded the rest two genotypes. Increase in Zn concentration due to the progressive increase in Zn levels to 5, 10, 15 and 20 mg Zn kg was 43.5, 71.5. 79.5 and 80.4% over control during the year 2011, respectively. The corresponding figures during the year 2012 were 47.8, 68.8, 74.8, 78.9%, respectively. Overall Zn ...
Zinc nutrition in rice production systems: a review
Plant and Soil, 2012
Background Zinc (Zn) deficiency is one of the important abiotic factors limiting rice productivity worldwide and also a widespread nutritional disorder affecting human health. Given that rice is a staple for populations in many countries, studies of Zn dynamics and management in rice soils is of great importance. Scope Changing climate is forcing the growers to switch from conventional rice transplanting in flooded soils to water-saving cultivation, including aerobic rice culture and alternate wetting and drying system.
Role of zinc application on rice growth and yield
Plant Archives, 2018
Zinc is an important nutrient for the healthy growth and development of plants among the micronutrients. Zinc deficiency is common in high pH soils. The widespread deficiency of nitrogen and phosphorus is followed by Zn deficiency. Grain yield may be enhanced by application of zinc in soil; however concentration of zinc can be improved by foliar spray of Zn fertilizer. Based on various studies, soil and foliar applications of zinc enhance the yield of crops. Flood-irrigated rice is highly sensitive to Zn deficiency and zinc availability can be increased by improving organic content and soil pH.
Field experiment was conducted to evaluate the "Effect of zinc ferti-fortification on yield and quality of basmati rice (O. sativa L.) under subtropical region of Jammu" at Sher-e-Kashmir University of Agricultural Science and Technology, Chatha, Jammu during kharif season 2015. The experiment was laid out in randomized block design with 12 treatments and three replications. The nutrient uptake by rice crop in terms of N, P, K and Zn was significantly influenced by different Zn-fertilization treatments. Significantly highest N, P, K and Zn uptake by grain and straw was recorded with the application of 4% Zn through ZnSO4.7H2O coated urea + 0.2% Zn foliar spray (ZnSO4.7H2O) + recommended P2O5 and K2O. The different zinc fortification treatments showed non-significant effect on soil fertility status after crop harvesting. Our results clearly indicated that application of 4% Zn through ZnSO4.7H2O coated urea + 0.2% Zn foliar spray (ZnSO4.7H2O) + recommended P2O5 and K2O is excellent sources of N and Zn for vital for the nutrient turnover, which improved long-term productivity of Basmati rice.