ABSTRACT
Background: The high yielding varieties and intensive cropping together with the shift towards the use of high NPK fertilizers has caused the decline in the level of micronutrients in soils below normal at which productivity of crops cannot be sustained. Methods: The GPS based 104 soil samples were collected and analyzed for fertility status and nutrient indices in 2017-18. Results: The pH and EC of soils of sugar factory varied from 7.78 to 8.73 and 0.17 to 1.33 dSm-1, respectively. The organic carbon and calcium carbonate content in soils also varied from 0.21 to 0.82% and 5.25 to 15.75%, respectively. The available nitrogen, phosphorus and potassium content in soils were ranged from 137.90 to 310.40, 6.37 to 27.12, and 257.60 to 763.20 kg ha-1 respectively. The soil fertility status recorded from very low to moderate in available nitrogen, from very low to moderately high available phosphorus and high to very high available potassium. The available boron ranged from 0.05 to 0.40 mg kg-1. The iron, manganese, zinc and copper content ranged from 2.00 to 6.08, 1.22 to 3.87, 0.24 to 1.86 and 1.09 to 4.42 mg kg-1, respectively. The soils of the sugar factory are sufficient in available copper. Conclusion: The 69.23%, 2.88% and 65.38%samples were deficient in available iron, manganese and zinc, respectively. The soil fertility status of sugar factory was assessed to be low in available nitrogen, medium in available phosphorus and high in available potassium respectively.
ABSTRACT
ObjectiveTo determine the impact of multinutrient supplements on adult nutrient status in Beijing, China. MethodsIn this randomized, double-blind, and placebo controlled trial, 152 healthy adults with a Recommended Food Score lower than 12 were equally and randomly divided into multinutrient supplement group and placebo group. Plasma and urine nutrient levels including vitamin A, B1, B2, B6, B12, C, folate, α- and γ-tocopherol, and carotenoids were determined before and after 8-week intervention. Acute response on vitamin C,carotenoids and tocopherols status were also determined on day 56. ResultsThree cases (5.7％) were lost to follow-up in placebo group. Compared with the placebo group, α-tocopherol [(18.23 ±0.82) vs.(14.55 ±0.73) μmol/L], β-carotene [(4.28±0.29) vs. (2.38±0.24) μmol/L], vitamin C [(42.65 ±2. 11) vs.(27.49±1.76) μmol/L], B6 [(323.51 ±15.88) vs. (69.43±10.47) nmol/L] and B12 [(1005.27 ±23.00) vs. (796.85±35.57) pmol/L] levels in plasma, B1 [(899.24±70.73) vs. (174.42±13.38)μg/g · Cr]and B2 [(3227.68 ±330.04) vs.(259.10 ±33.33) μg/g · Cr] levels in urine, and folate level in red blood cells [(720.09 ±21.33) vs. (633.17 ±28.75) nmol/L] significantly increased after 8 weeks of intervention (all P=0.0000), while plasma γ-tocopherol level significantly decreased [(2.18 ±0.13) vs. (2.87 ±0.26) μmol/L,P=0.0001]. Significant acute response on vitamin C was also observed in the multinutrient supplement group [(54.53 ±2.43) vs. (23.02 ± 1.77) μmol/L, P =0.0000]. ConclusionThis multinutrient supplement can effectively improve the nutrient status of healthy Chinese adults.
ABSTRACT
The Solimoes/Amazonas River channel high and low land floodplain soils were studied on Manacapuru, Iranduba, Itacoatiara and Silves townships, with purpose the evaluate the chemical characteristics of floodplain soils, as well as, the effect of land use system on soil nutrient status. Nineteen different systems were sampled, eight in the low Solimões river and eleven in medium Amazonas river. Sampling was performed on 0-10, 10-20 and 20-40 cm deep upper soil layers. Contents of pH, Al, Ca, Mg, K, P, C, N, Zn, Cu, Mn, and Fe, were determined. All the land use shows high available of Ca, Mg, P, Zn, Cu, Mn e Fe. Despite the majority soil samples presented high contents of K, the secondary forest and agroforestry systems presented medium content of K, demonstrated this nutrient can be deficient in some systems in the floodplain soils. The systems of forest and secondary forest presented more acidity and higher available Al, contracting with the others systems land use. C and N levels were lower confirming N to be one of the main limiting factors on the farming yield in the Amazonian floodplains.
Foram estudados os solos de várzea alta e baixa em quatro municípios situados na calha dos rios baixo Solimões e médio Amazonas (Manacapuru, Iranduba, Itacoatiara e Silves), com o objetivo de avaliar as características químicas dos solos assim como os possíveis efeitos da unidade de paisagem e dos diferentes sistemas de uso da terra sobre o estoque de nutrientes nesses solos. Um total de 19 diferentes sistemas de uso da terra foi amostrado, sendo oito no baixo rio Solimões e onze no médio rio Amazonas. Os solos foram amostrados nas camadas de 0-10, 10-20 e 20-40 cm de profundidade. As determinações efetuadas foram: pH, Al, Ca, Mg, K, P, C, N, Zn, Cu, Mn e Fe. Todos os sistemas de uso da terra amostrados apresentaram uma alta disponibilidade de Ca, Mg, P, Zn, Cu, Mn e Fe. Apesar do elevado teor de K encontrado na maioria das amostras analisadas, as áreas de capoeiras e sítios na região do médio rio Amazonas, apresentaram uma concentração média de K mostrando que esse nutriente em algumas áreas de várzea pode se tornar limitante. Ao contrário dos outros sistemas de cultivo que apresentaram baixas concentrações de Al trocável, os sistemas de floresta e capoeiras apresentaram acidez elevada e valores tóxicos, desse elemento. Na maior parte dos sistemas de uso da terra estudados, os níveis de C e N no solo foram baixos confirmando que o N é um dos principais nutrientes limitantes para a produção agrícola em área de várzea na Amazônia.