Physiological Mechanism and Nutrient Management Strategies for Flood Tolerance in Rice Grown in Lowland Flood Prone Ecosystem

Trends over the past 25 years indicate that Argentina’s growth in its grain crop productivity has largely been supported by the depletion of the extensive fertility of its Pampean soils. Long-term research provides insight into sustainable nutrient management strategies ready for wide-scale adoption.

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Analysis of plant nutrient management strategies: Conventional and alternative approaches

Agriculture and Human Values ◽

10.1007/s10460-003-1221-7 ◽

2004 ◽

Vol 21 (4) ◽

pp. 347-353 ◽

Cited By ~ 4

Author(s):

Stephen E. Gareau

Keyword(s):

Nutrient Management ◽

Management Strategies ◽

Plant Nutrient ◽

Alternative Approaches

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Effects of Irrigation and Fertilization on the Morphophysiological Traits of Populus sibirica Hort. Ex Tausch and Ulmus pumila L. in the Semiarid Steppe Region of Mongolia

Plants ◽

10.3390/plants10112407 ◽

2021 ◽

Vol 10 (11) ◽

pp. 2407

Author(s):

Ser-Oddamba Byambadorj ◽

Byung Bae Park ◽

Jonathan O. Hernandez ◽

Enkhchimeg Tsedensodnom ◽

Otgonsaikhan Byambasuren ◽

...

Keyword(s):

Leaf Area ◽

Nutrient Management ◽

Sustainable Forest Management ◽

Management Strategies ◽

Semiarid Region ◽

Leaf Biomass ◽

Ulmus Pumila ◽

Rainfall Events ◽

Arid And Semiarid Ecosystems ◽

Arid And Semiarid

Desertification is impeding the implementation of reforestation efforts in Mongolia. Many of these efforts have been unsuccessful due to a lack of technical knowledge on water and nutrient management strategies, limited financial support, and short-lived rainfall events. We investigated the effects of irrigation and fertilization on the morphophysiological traits of Populus sibirica Hort. Ex Tausch and Ulmus pumila L. and to suggest irrigation and fertilization strategies for reforestation. Different irrigation and fertilizer treatments were applied: no irrigation, 2 L h−1, 4 L h−1, and 8 L h−1 of water; no fertilizer, 2 L h−1 + NPK, 4 L h−1 + NPK, and 8 L h−1 + NPK; and no compost, 2 L h−1 + compost, 4 L h−1 + compost, and 8 L h−1 + compost. The leaf area (LA) and specific leaf area (SLA) of both species responded positively to 4 and 8 L h−1. Results also showed that the addition of either NPK or compost to 4 or 8 L h−1 irrigation resulted in a higher LA, SLA, and leaf biomass (LB). Total chlorophyll content decreased with irrigation in both species. The same pattern was detected when a higher amount of irrigation was combined with fertilizers. Lastly, we found that both diurnal and seasonal leaf water potential of plants grown in 4 or 8 L h−1 were significantly higher than those of plants grown in control plots. Therefore, 4 or 8 L h−1 with either NPK or compost has shown to be the optimal irrigation and fertilization strategy for the species in an arid and semiarid region of Mongolia. Results should provide us with a better understanding of tree responses to varying amounts of irrigation with or without fertilizer in pursuit of sustainable forest management in arid and semiarid ecosystems.

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Seasonal Nearshore Occurrence of the Neurotoxin β N methylamino L alanine (BMAA) in Lake Winnipeg, Canada

Environment and Pollution ◽

10.5539/ep.v5n1p110 ◽

2016 ◽

Vol 5 (1) ◽

pp. 110 ◽

Cited By ~ 8

Author(s):

Eva Pip ◽

Kimber Munford ◽

Lindsay Bowman

Keyword(s):

Chlorophyll A ◽

Nutrient Management ◽

Management Strategies ◽

Seasonal Fluctuation ◽

Inverse Correlation ◽

Water Quality Monitoring ◽

Inorganic Phosphorus ◽

Lake Winnipeg ◽

Nitrate N ◽

Shading Effects

Seasonal fluctuation patterns of the neurotoxic amino acid β N methylamino L alanine (BMAA) were examined at four-day intervals during the ice-free season in water at three nearshore stations in the south basin of Lake Winnipeg, Canada. BMAA patterns were significantly exponentially correlated with concurrent phaeophytin, and inversely with chlorophyll a, indicating that free BMAA concentrations increased as blooms declined. BMAA was also significantly related to preceding microcystin concentrations, and as chlorophyll a declined, the proportion of BMAA relative to microcystin increased. Cross correlations identified significant relationships between BMAA and immediately preceding nitrate-N/inorganic phosphorus ratios, nitrate-N, rainfall, and a marginal inverse correlation with inorganic phosphorus. Total suspended solids levels were also significantly associated with BMAA, likely due to shading effects. A very high BMAA concentration was found under collapse of intense bloom conditions. These results have implications for water quality monitoring, nutrient management strategies and public health.

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Enhanced nitrogen management strategies for winter wheat production in the Canadian prairies

Canadian Journal of Plant Science ◽

10.1139/cjps-2017-0319 ◽

2018 ◽

Vol 98 (3) ◽

pp. 683-702 ◽

Cited By ~ 4

Author(s):

B.L. Beres ◽

R.J. Graf ◽

R.B. Irvine ◽

J.T. O’Donovan ◽

K.N. Harker ◽

...

Keyword(s):

Winter Wheat ◽

Grain Yield ◽

Nutrient Management ◽

Management Strategies ◽

Maximum Yield ◽

Nitrification Inhibitor ◽

Early Spring ◽

Nitrification Inhibitors ◽

Side Band ◽

Application Method

To address knowledge gaps around enhanced efficiency urea fertilizer efficacy for nitrogen (N) management, a study was designed to improve integrated nutrient management systems for western Canadian winter wheat producers. Three factors were included in Experiment 1: (i) urea type [urea, urea + urease inhibitor—Agrotain®; urea + urease and nitrification inhibitor—SuperU®, polymer-coated urea—Environmentally Smart Nitrogen® (ESN®), and urea ammonium nitrate (UAN)], (ii) application method (side-band vs. spring-broadcast vs. 50% side-band: 50% spring-broadcast), and (iii) cultivar (AC Radiant hard red winter wheat vs. CDC Ptarmigan soft white winter wheat). The Agrotain® and CDC Ptarmigan treatments were removed in Experiment 2 to allow for additional application methods: (i) fall side-band, (ii) 50% side-band — 50% late fall broadcast, (iii) 50% side-band — 50% early spring broadcast, (iv) 50% side-band — 50% mid-spring broadcast, and (v) 50% side-band — 50% late spring broadcast. CDC Ptarmigan produced superior grain yield and N utilization over AC Radiant. Grain yield and protein content were influenced by N form and application method. Split applications of N usually provided the maximum yield and protein, particularly with Agrotain® or SuperU®. An exception to the poor fall-application results was the SuperU® treatments, which produced similar yield to the highest-yielding treatments. The results suggest that split applications of N might be most efficient for yield and protein optimization when combined with an enhanced efficiency urea product, particularly with urease or urease + nitrification inhibitors, and if the majority of N is applied in spring.

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Nutrient Management Strategies on Heterogeneously Fertile Granitic-Derived Soils in Subhumid Zimbabwe

Agronomy Journal ◽

10.2134/agronj14.0466 ◽

2015 ◽

Vol 107 (3) ◽

pp. 1068-1076 ◽

Cited By ~ 3

Author(s):

Natasha Kurwakumire ◽

Regis Chikowo ◽

Shamie Zingore ◽

Florence Mtambanengwe ◽

Paul Mapfumo ◽

...

Keyword(s):

Nutrient Management ◽

Management Strategies

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Micronutrient fractionation and plant availability in bauxite-processing residue sand

Soil Research ◽

10.1071/sr08201 ◽

2009 ◽

Vol 47 (5) ◽

pp. 518 ◽

Cited By ~ 17

Author(s):

Chitdeshwari Thiyagarajan ◽

I. R. Phillips ◽

B. Dell ◽

Richard W. Bell

Keyword(s):

Nutrient Management ◽

Total Concentration ◽

Management Strategies ◽

Sodium Content ◽

Sand Particle ◽

Leaf Analysis ◽

Mn Oxide ◽

Fe And Mn ◽

Poor Nutritional Status ◽

Low Levels

Bauxite-processing residue must be disposed of in specifically designed facilities for long-term management. Consideration of alkalinity, salinity, sodium content, and poor nutritional status is essential for successful rehabilitation of residue disposal areas (RDA). The aim of this study was to examine the availability and distribution of the micronutrients, B, Cu, Fe, Mn, and Zn, in (i) fresh bauxite-processing residue sand (particle size >150 μm) with and without gypsum amendment, and (ii) aged residue sand from a 4-year-old rehabilitated RDA that had received past gypsum and fertiliser addition. Samples of fresh residue sand from India and Australia exhibited high alkalinity, high salinity, and sodicity. Gypsum addition significantly lowered pH, soluble Na, and alkalinity. Aged residue sand had low levels of all micronutrients, with low extractability for Zn and Mn followed by B, Cu, and Fe. Fractionation showed that 30–78% of Zn and Mn and 40–60% of B existed in non-available (residual) forms. The next most dominant fractions were the Fe and Mn oxide-bound and carbonate-bound fractions. Plant-available fractions (i.e. exchangeable and organically bound) contributed <1% of the total concentration. Total concentration was found to be a reliable indicator for Zn, Cu, and B extractability but not for DTPA-extractable forms of Fe and Mn. Leaf analysis of vegetation grown on aged residue sand indicated deficiencies of Mn and B. Results demonstrated that bauxite-processing residue sand contained very low levels of B, Mn, and Zn and these concentrations may be limiting to plant growth. Distribution of micronutrients among chemical pools was significantly influenced by pH, organic carbon, exchangeable Na, and alkalinity of residue. Nutrient management strategies that account for the characteristics of residue sand need to be developed for residue rehabilitation. Importantly, strategies to limit the conversion of nutrients to non-available forms are required to minimise micronutrient disorders.

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