scholarly journals Spatial Distribution of Soil Nitrogen, Phosphorus and Potassium Stocks in Moso Bamboo Forests in Subtropical China

Forests ◽  
2016 ◽  
Vol 7 (12) ◽  
pp. 267 ◽  
Author(s):  
Xiaolu Tang ◽  
Mingpeng Xia ◽  
Fengying Guan ◽  
Shaohui Fan
Keyword(s):  
Spatial Distribution ◽  
Soil Nitrogen ◽  
Moso Bamboo ◽  
Subtropical China ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Exploring the Yield Response of Paddy (Oryza sativa L.) under Varying Levels of Soil Nitrogen, Phosphorus and Potassium

2020 ◽  
Vol 31 (4) ◽  
pp. 01
Author(s):  
H. P. G. T. N. Kulasinghe ◽  
U. W. A. Vitharana ◽  
R. S. Dharmakeerthi ◽  
D. N. Sirisena ◽  
W. M. U. K. Rathnayake
Keyword(s):  
Oryza Sativa ◽  
Soil Nitrogen ◽  
Yield Response ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals BALANÇO DA FERTIRRIGAÇÃO EM MELOEIRO “PELE-DE-SAPO”

Irriga ◽  
2007 ◽  
Vol 12 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Manoel Januário da Silva Júnior ◽  
José Francismar de Medeiros ◽  
Fábio Henrique Tavares de Oliveira ◽  
Indalécio Dutra
Keyword(s):  
Soil Nitrogen ◽  
Cucumis Melo ◽  
Nutrient Balance ◽  
Rio Grande ◽  
Critical Periods ◽  
Management Efficiency ◽  
Crop Cycle ◽  
Phosphorus And Potassium ◽  
Cucumis Melo L ◽  
Nitrogen Phosphorus

BALANÇO DA FERTIRRIGAÇÃO EM MELOEIRO “PELE-DE-SAPO”  Manoel Januário da Silva Júnior1; José Francismar de Medeiros2; Fábio Henrique Tavares de Oliveira3; Indalécio Dutra21Departamento de Engenharia Rural, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, SP, [email protected] de Ciências Ambientais, Universidade Federal Rural do Semi-Árido, Mossoró 3Departamento de Solos e Engenharia Rural, CCA, Universidade Federal da Paraiba, Areia, PB,  1 RESUMO O melão produzido no estado do Rio Grande do Norte é cultivado sob irrigação, sendo uma das culturas em que mais se pratica a fertirrigação. A fertirrigação tem se mostrado como a técnica mais adequada para parcelar a dose dos nutrientes em várias aplicações durante o ciclo da cultura. Entretanto, ainda não se conhece a eficiência dessa técnica. O objetivo deste trabalho foi avaliar o balanço dos nutrientes no sistema solo-planta, aplicados através da fertirrigação identificando os períodos críticos para o manejo da fertirrigação. Os tratamentos foram: doses de nitrogênio (83, 119 e 156 kgN ha-1) e doses de potássio (190, 271 e 352 kg K2O ha-1) aplicadas via fertirrigação e o experimento foi montado em blocos aleatorizados com três repetições. Coletou-se solo e planta aos 22, 33, 43, 54 e 69 dias após a semeadura e determinaram-se os teores de N, P e K na planta e no solo. O aumento da dose de nitrogênio provocou aumento das perdas desse nutriente e, quando se aumentou a dose de potássio houve acúmulo no solo. As maiores perdas de nitrogênio, fósforo e potássio ocorreram no período de maior exigência nutricional da cultura. UNITERMOS: Cucumis melo L., manejo da fertirrigação, índices de eficiência  SILVA JÚNIOR, M. J. da; MEDEIROS, J. F. de; OLIVEIRA, F. H. T. de; DUTRA, I. BALANCE OF FERTIGATION IN “PELE-DE-SAPO” MELON PLANTS  2 ABSTRACT Melon production in Rio Grandedo Norte state (Brazil) is grown under irrigation and it is one of the crops where fertigation is more used. The importance of fertigation technique is attributed to nutrient dose fractioning into several applications during crop cycle. Therefore, the efficiency of this technique is not known yet. This study aimed to evaluate nutrient balance applied through fertigation in a soil-plant system to identify critical periods for fertigation management. The treatments consisted of nitrogen doses (83, 119, and 156 kgN ha-1) and potassium doses (190, 271, and 352 kg K2O ha-1) applied via fertigation and the experimental design was randomized blocks with three replications. Soil and plants were sampled at 22, 33, 43, 54 and 69 days after seeding to determine plant and soil contents of N, P and K. The increase in nitrogen dose raised soil nitrogen losses, but the increase in potassium dose caused accumulation in the soil. Higher losses of nitrogen, phosphorus and potassium occurred in the crop higher nutritional demand stage. KEYWORDS: Cucumis melo L., fertigation management, efficiency indices

scholarly journals Spatial distribution of soil organic carbon stock in Moso bamboo forests in subtropical China

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Xiaolu Tang ◽  
Mingpeng Xia ◽  
César Pérez-Cruzado ◽  
Fengying Guan ◽  
Shaohui Fan
Keyword(s):  
Spatial Distribution ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Stock ◽  
Moso Bamboo ◽  
Subtropical China ◽  
Soil Organic Carbon Stock ◽  
Organic Carbon Stock

Regional and site-related patterns of soil nitrogen, phosphorus, and potassium stocks and Norway spruce nutrition in mountain forests of the Bavarian Alps

2014 ◽  
Vol 386 (1-2) ◽  
pp. 151-169 ◽  
Author(s):  
Jörg Prietzel ◽  
Dominik Christophel ◽  
Christopher Traub ◽  
Eckart Kolb ◽  
Alfred Schubert
Keyword(s):  
Norway Spruce ◽  
Soil Nitrogen ◽  
Mountain Forests ◽  
Bavarian Alps ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Spatial Distribution and Temporal Variability of Ammonium-Nitrogen, Phosphorus, and Potassium in a Rice Field in Corrientes, Argentina

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Luis Alberto Morales ◽  
Eva Vidal Vázquez ◽  
Jorge Paz-Ferreiro
Keyword(s):  
Spatial Distribution ◽  
Soil Nutrients ◽  
Rice Field ◽  
Growth Period ◽  
Field Work ◽  
Ammonium Nitrogen ◽  
Effective Management ◽  
Rice Growth ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Proper and effective management of soil nutrients requires assessment of their variability at the field scale. We compare the effects of lime amendment rate on the spatial variability of three macronutrient forms (NH4+-N, Olsen P, and Mehlich-1 K) in a paddy soil at three different dates during the growth period of a rice crop. The field work was carried out near Corrientes, Argentina. Lime treatments were 0, 625, and 1250 kg ha−1dolomite, and each liming dose was applied to a 1.7 ha field. Ninety-three soil samples per treatment were first collected in aerobic conditions and then two more times after flooding, at bunch formation and flowering. SoilNH4+-N increased along time, whereas P was highest at bunch formation and K steadily decreased along the rice growth period. Dolomite addition increased macronutrient availability at the first and second samplings, but its effects at the third sampling depended on the element. The three soil nutrients analyzed displayed strong patterns of spatial dependence for the three lime treatments and at the three periods studied. The areas with relative high or low macronutrient concentrations within each field were not stable throughout the rice growth period. Seasonality in the spatial distribution of macronutrients may be of agronomic value for site specific management.

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