10 research outputs found
Response of carrots (Daucus carota L.) to applied phosphorus leaching on a Karrakatta sand, under two irrigation regimes
Phosphorus requirements of winter-planted lettuce (Lactuca sativa L.) on a Karrakatta sand and the residual value of phosphate as determined by soil test
Modifying sandy soils with the fine residue from bauxite refining to retain phosphorus and increase plant yield
Yield and postharvest quality of winter growing crisphead lettuce as affected by doses of nitrogen and molybdenum Rendimento e qualidade pĂłs-colheita de alface americana em função de doses de nitrogĂȘnio e molibdĂȘnio
The trial was carried out at TrĂȘs Pontas, Minas Gerais State, Brazil, from April to July 2003, to evaluate the influence of nitrogen and molybdenum rates on productive characteristics and postharvest quality of crisphead lettuce (Lactuca sativa L.). A randomized complete block design with three replications was used. Treatments were a factorial combination of four nitrogen rates (0.0; 60.0; 120.0 and 180.0 kg ha-1) applied in additional the dose commonly used by growers (60 kg ha-1 of N) and five foliar molybdenum rates (0.0; 35.1; 70.2; 105.3 and 140.4 g ha-1). The total and commercial fresh weight and head circumference showed significant effects for doses of nitrogen and of molybdenum, as well as for their interaction. No significant effects of the treatments for stem length were observed. There was a linear effect of N and Mo doses for postharvest conservation at 28 days, and the rate of 150.0 kg ha-1 of N showed the best conservation at 35 days after the harvest. The percentage of dry matter showed quadratic effects, and the doses of 95.9 kg ha-1 of N and 75.3 kg ha-1 of Mo showed the highest return.<br>O trabalho foi conduzido no municĂpio de TrĂȘs Pontas, Sul de Minas Gerais, de abril a julho de 2003, com o objetivo de avaliar a influĂȘncia de doses de nitrogĂȘnio e molibdĂȘnio nas caracterĂsticas produtivas e qualidade pĂłs-colheita da alface tipo americana (Lactuca sativa L.). Utilizou-se o delineamento de blocos ao acaso em arranjo fatorial 4x5, compreendendo quatro doses de nitrogĂȘnio em cobertura adicionais Ă dose aplicada pelo produtor de 60 kg/ha de N (0; 60; 120 e 180 kg ha-1) e cinco doses de molibdĂȘnio via foliar (0,0; 35,1; 70,2; 105,3 e 140,4 g ha-1) com trĂȘs repetiçÔes. As massas fresca total e comercial e a circunferĂȘncia da cabeça evidenciaram efeitos significativos para doses de nitrogĂȘnio em cobertura e de molibdĂȘnio, assim como para sua interação. NĂŁo se observou efeito significativo dos tratamentos para comprimento do caule. Houve uma resposta linear para doses de N e Mo para conservação pĂłs-colheita aos 28 dias, sendo que a dose de 150,0 kg ha-1 de N em cobertura promoveu a melhor conservação aos 35 dias apĂłs a colheita. A dose de 95,9 kg ha-1 de N em cobertura e a dose 75,3 kg ha-1 de Mo propiciariam o maior retorno em termos de percentagem de massa seca
Yield and Nitrogen Use of Irrigated Processing Potato in Response to Placement, Timing and Source of Nitrogen Fertilizer in Manitoba
Results of the clean-up operation to reduce pollution on flooded agricultural fields after the red mud spill in Hungary
Nutrient and Water Use Efficiency in Soil:The Influence of Geological Mineral Amendments
Mineral amendments are known to improve the physical, chemical and biological properties of soil, which in turn can enhance the efficiency of nutrient and water use by plants. This chapter discusses the current state of the knowledge regarding the application of geological mineral amendments in soil which either helps to retain nutrients in soils or prevents losses of nutrients from soil and directly or indirectly contributes to improve the overall nutrient use efficiency (NUE). A critical analysis of the currently available research information recommends a site-specific (precision) management approach in order to explore the most beneficial effects of the mineral materials for increasing plantsâ nutrient and water use efficiency. The management practices should include an integrated plant nutrition system (IPNS) for the best utilisation of resources including mineral materials, fertilisers and organic inputs. This holds the potential for leading to a reduced fertiliser input in modern agriculture and therefore may lower the cost of agricultural production without impacting the crop yield