Dennis Tuyogon - Academia.edu (original) (raw)

Papers by Dennis Tuyogon

Soil Science Society of America Journal, 2016

Core Ideas Rice grain‐Zn concentration increased with more aerobic soil conditions. Fertilizer‐Zn... more Core Ideas Rice grain‐Zn concentration increased with more aerobic soil conditions. Fertilizer‐Zn applied to soil had limited effect on rice grain‐Zn concentration. Rice paddy water management affected soil redox potential and DTPA‐extractable Zn. Combined water and Zn management are useful for agronomic Zn biofortification. Agronomic biofortification was not sufficient to meet rice Zn nutrition targets. Increasing rice (Oryza sativa) grain‐Zn concentration is important for achieving improved human nutrition. Our objective was to understand how agronomic management practices, including water management and fertilizer‐Zn application rate and timing, affect plant growth, grain‐Zn concentration, and yield of rice genotypes. In a series of four‐field experiments over three seasons, we tested multiple combinations of water management techniques and fertilizer‐Zn application techniques. The use of alternate wetting and drying (AWD) water management increased (p < 0.001) soil redox pote...

Metalloids like arsenic (As) and antimony (Sb) are naturally present at low concentrations but th... more Metalloids like arsenic (As) and antimony (Sb) are naturally present at low concentrations but the increased use of these metalloids in the environment has led to environmental soil and groundwater contamination issues and understanding their biogeochemical cycling is of prime importance to predict potential contamination issues. Despite its toxicity, Sb received little analytical attention compared to other toxic heavy metals. However, speciation analysis is necessary to understand the toxicity and fate of each metalloid species in the environment. The speciation of metalloids is however often limited to the differentiation of oxidation states and identification of stable organic species by techniques such as ICP and LC-MS. The detection and identification of more reactive, relatively weak complexes that can play a preponderant role in the transport of these elements are however much less known. There is a wide range of available spectroscopic techniques for total Sb and As determi...

In a context of increasing food demands and a changing climate causing decreased water availabili... more In a context of increasing food demands and a changing climate causing decreased water availability, alternative irrigation management (AIM) in paddy rice production is broadly being applied in Asia and other rice producing regions. In combination with efficient soil fertilization management, AIM aims at sustainably intensifying rice production while using less water. However, AI ’s increasing popularity may impose a trade-off from saving water to increasing GHG emissions (mainly of N2O) and affecting micronutrient availability in paddy soils. The general objective of this research was to assess the effect of AIM on micronutrient availability (Fe, Mn, Cu and Zn), GHG emissions and other relevant related soil and plant parameters. Soils from the plough layer of 3 Philippine farmers’ paddy fields with differing soil textures were collected for a greenhouse pot experiment. The samples were subjected to three commonly applied irrigation techniques, differing in the number and duration o...

Synthesis and Characterization of Chitosan Citrate (CC), 2-Sulfobenzoyl Chitosan (SBC) and 2-Sulfobenzoyl Chitosan Citrate (SBC-CC) for Cu2+ Adsorption: Equilibrium and Kinetics Studies

Effect of rice farming’s water saving management on greenhouse gas emissions and micronutrient availability in Philippine paddy soils (Greenhouse experiment)

Effect of rice farming’s water saving management on greenhouse gas emissions and micronutrient availability in Philippine paddy soils (Greenhouse experiment)

Soil Science Society of America, 2016

Increasing rice (Oryza sativa) grain-Zn concentration is important for achieving improved human n... more Increasing rice (Oryza sativa) grain-Zn concentration is important for achieving improved human nutrition. our objective was to understand how agronomic management practices, including water management and fertilizer-Zn application rate and timing, affect plant growth, grain-Zn concentration , and yield of rice genotypes. In a series of four-field experiments over three seasons, we tested multiple combinations of water management techniques and fertilizer-Zn application techniques. The use of alternate wetting and drying (AWd) water management increased (p < 0.001) soil redox potential and diethylene triamine pentaacetic acid (dTPA)-extractable soil Zn compared with continuous flooding (CF) in the 0-to 2-cm soil depth, but not always in the 2-to 10-cm depth. on average, AWd grain-Zn concentration increased 9% over CF without any yield penalty. Fertilizer-Zn application increased dTPA-extractable Zn only in the top soil layer and only temporarily , with a corresponding increase in grain-Zn concentration only at rates > 10 kg Zn ha-1. different timings of fertilizer-Zn application (from basal to flowering) had no effect on grain-Zn concentration or yield. overall, our results indicated that AWd had a consistent and larger positive effect than fertilizer-Zn application on grain-Zn concentration. However, the increase in grain-Zn concentration due to fertilizer-Zn or water management was small, up to 2 mg Zn kg-1 brown rice, implying that improved agronomic management alone is not sufficient to meet the target increase of at least 10 mg Zn kg-1 , but is a useful complementary strategy for enhancing the performance of Zn-enriched rice by improving soil-Zn availability.

Soil Science Society of America Journal, 2016

Core Ideas Rice grain‐Zn concentration increased with more aerobic soil conditions. Fertilizer‐Zn... more Core Ideas Rice grain‐Zn concentration increased with more aerobic soil conditions. Fertilizer‐Zn applied to soil had limited effect on rice grain‐Zn concentration. Rice paddy water management affected soil redox potential and DTPA‐extractable Zn. Combined water and Zn management are useful for agronomic Zn biofortification. Agronomic biofortification was not sufficient to meet rice Zn nutrition targets. Increasing rice (Oryza sativa) grain‐Zn concentration is important for achieving improved human nutrition. Our objective was to understand how agronomic management practices, including water management and fertilizer‐Zn application rate and timing, affect plant growth, grain‐Zn concentration, and yield of rice genotypes. In a series of four‐field experiments over three seasons, we tested multiple combinations of water management techniques and fertilizer‐Zn application techniques. The use of alternate wetting and drying (AWD) water management increased (p < 0.001) soil redox pote...

Metalloids like arsenic (As) and antimony (Sb) are naturally present at low concentrations but th... more Metalloids like arsenic (As) and antimony (Sb) are naturally present at low concentrations but the increased use of these metalloids in the environment has led to environmental soil and groundwater contamination issues and understanding their biogeochemical cycling is of prime importance to predict potential contamination issues. Despite its toxicity, Sb received little analytical attention compared to other toxic heavy metals. However, speciation analysis is necessary to understand the toxicity and fate of each metalloid species in the environment. The speciation of metalloids is however often limited to the differentiation of oxidation states and identification of stable organic species by techniques such as ICP and LC-MS. The detection and identification of more reactive, relatively weak complexes that can play a preponderant role in the transport of these elements are however much less known. There is a wide range of available spectroscopic techniques for total Sb and As determi...

In a context of increasing food demands and a changing climate causing decreased water availabili... more In a context of increasing food demands and a changing climate causing decreased water availability, alternative irrigation management (AIM) in paddy rice production is broadly being applied in Asia and other rice producing regions. In combination with efficient soil fertilization management, AIM aims at sustainably intensifying rice production while using less water. However, AI ’s increasing popularity may impose a trade-off from saving water to increasing GHG emissions (mainly of N2O) and affecting micronutrient availability in paddy soils. The general objective of this research was to assess the effect of AIM on micronutrient availability (Fe, Mn, Cu and Zn), GHG emissions and other relevant related soil and plant parameters. Soils from the plough layer of 3 Philippine farmers’ paddy fields with differing soil textures were collected for a greenhouse pot experiment. The samples were subjected to three commonly applied irrigation techniques, differing in the number and duration o...

Synthesis and Characterization of Chitosan Citrate (CC), 2-Sulfobenzoyl Chitosan (SBC) and 2-Sulfobenzoyl Chitosan Citrate (SBC-CC) for Cu2+ Adsorption: Equilibrium and Kinetics Studies

Effect of rice farming’s water saving management on greenhouse gas emissions and micronutrient availability in Philippine paddy soils (Greenhouse experiment)

Effect of rice farming’s water saving management on greenhouse gas emissions and micronutrient availability in Philippine paddy soils (Greenhouse experiment)

Soil Science Society of America, 2016

Increasing rice (Oryza sativa) grain-Zn concentration is important for achieving improved human n... more Increasing rice (Oryza sativa) grain-Zn concentration is important for achieving improved human nutrition. our objective was to understand how agronomic management practices, including water management and fertilizer-Zn application rate and timing, affect plant growth, grain-Zn concentration , and yield of rice genotypes. In a series of four-field experiments over three seasons, we tested multiple combinations of water management techniques and fertilizer-Zn application techniques. The use of alternate wetting and drying (AWd) water management increased (p < 0.001) soil redox potential and diethylene triamine pentaacetic acid (dTPA)-extractable soil Zn compared with continuous flooding (CF) in the 0-to 2-cm soil depth, but not always in the 2-to 10-cm depth. on average, AWd grain-Zn concentration increased 9% over CF without any yield penalty. Fertilizer-Zn application increased dTPA-extractable Zn only in the top soil layer and only temporarily , with a corresponding increase in grain-Zn concentration only at rates > 10 kg Zn ha-1. different timings of fertilizer-Zn application (from basal to flowering) had no effect on grain-Zn concentration or yield. overall, our results indicated that AWd had a consistent and larger positive effect than fertilizer-Zn application on grain-Zn concentration. However, the increase in grain-Zn concentration due to fertilizer-Zn or water management was small, up to 2 mg Zn kg-1 brown rice, implying that improved agronomic management alone is not sufficient to meet the target increase of at least 10 mg Zn kg-1 , but is a useful complementary strategy for enhancing the performance of Zn-enriched rice by improving soil-Zn availability.