Nitrogen requirements of lettuce under sprinkler irrigation and trickle fertigation on a spearwood sand

McPharlin, I. R.; Aylmore, PM; Jeffery, R. C.

doi:10.1080/01904169509364897

Cited by 17 publications

(8 citation statements)

References 15 publications

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“…Esses resultados são pouco inferiores a máxima produtividade de alface tipo americana, obtida com 168,0 kg/ha de N, informados por Mcpharlin et al (1995), relatando diferentes autores, para as condições do Arizona, tanto em cultivos na primavera como no outono. Assim, como estão próximos à dose de 155,0 kg/ha de N, encontrados por Tei et al (2000), para alface tipo lisa e "Butterhead".…”

Section: Resultsunclassified

Rendimento e teores de macronutrientes em alface tipo americana em função de doses de nitrogênio e molibdênio em cultivo de verão

et al. 2009

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Conduziu-se o trabalho, no município de Três Pontas, Sul de Minas Gerais, no período de outubro a dezembro de 2002, objetivando avaliar a influência de doses de nitrogênio e molibdênio no rendimento e teor de macronutrientes da alface americana (Lactuca sativa L.). Utilizou-se o delineamento de blocos ao acaso em arranjo fatorial 4 x 5, compreendendo quatro doses de nitrogênio em cobertura adicionais a dose aplicada pelo produtor de 60 kg/ha de N (0, 60, 120 e 180 kg/ha) e cinco doses de molibdênio via foliar (0,0; 35,1; 70,2; 105,3 e 140,4 g/ha) e três repetições. A maior massa fresca comercial foi obtida com a dose de 89,1 kg/ha de nitrogênio em cobertura e 94,2 g/ha de molibdênio. Os resultados indicaram incremento no teor de nitrogênio e fósforo com as doses de nitrogênio e molibdênio. Os teores de potássio reduziram-se com o aumento das doses de nitrogênio e molibdênio. Para os teores de cálcio, magnésio e enxofre verificou-se efeito significativo da interação N x Mo, cujas concentrações na parte aérea aumentaram com as doses de nitrogênio e molibdênio.

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Section: Resultsunclassified

Rendimento e teores de macronutrientes em alface tipo americana em função de doses de nitrogênio e molibdênio em cultivo de verão

et al. 2009

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“…According to Biernbaum (1992), the key to reducing groundwater contamination by nitrate due to leaching or runoff is to define clearly the water and nutrient requirements of plants. In the meantime, the recommended rates of N for maximum yields of vegetables vary greatly depending on soil fertility and vegetable variety (McPharlin et al, 1995) and are difficult to determine.…”

Section: Introductionmentioning

confidence: 99%

“…Leaching of NO 3 À -N occurs in many vegetable production areas because N application rates often exceed crop demand (Biernbaum, 1992;Jackson et al, 1994;McNeal et al, 1995). High inputs of N and excessive irrigation make these intensive production areas particularly sensitive to nitrate leaching (Power and Schepers, 1989;McPharlin et al, 1995). In addition, plants do not make use of all the N applied and farmers incur economic loss by applying more N than is required to obtain a positive yield response (MacDonald et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Environmental implications of low nitrogen use efficiency in excessively fertilized hot pepper (Capsicum frutescens L.) cropping systems

Zhu

Christie³

et al. 2005

Agriculture, Ecosystems & Environment

200

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A randomized-block greenhouse plot experiment was conducted on N utilization efficiency and N losses in intensive hot pepper (Capsicum frutescens L.) production systems typical of commercial practice in Shouguang, an important vegetable production area in Shandong province, northeast China. Crop yield and N utilization, soil mineral N dynamics and potential nitrate leaching losses were studied in control plots receiving no N fertilizer or organic manure and in experimental plots receiving 0, 600, 1200 or 1800 kg urea-N ha À1 plus a basal dressing of 15 t ha À1 air-dried poultry manure supplying 178 kg N ha À1 . Ammonia volatilization from the soil surface was monitored. A microplot was established in each of the plots receiving 1200 kg urea-N ha À1 (the local average commercial fertilizer N application rate), the urea applied to the microplot was labelled with 10 atom % 15 N tracer and residual soil 15 N and 15 N in harvested plant parts were determined. Previous intensive cropping led to a very high residual soil mineral N content (1117 kg N ha À1 ) before the experiment began and control plots gave a satisfactory mean fruit yield of 5.7 t DM ha À1 with no significant yield response to applied fertilizer and poultry manure. Only 10% of applied fertilizer N was recovered in the aboveground parts of the crop and about 52% was lost from the soil-plant system. Substantial nitrate leaching losses occurred using the two highest fertilizer N application rates but there was little NH 3 volatilization from the soil surface. In a survey of 94 wells in Shouguang, the NO 3 À -N concentrations in water used for drinking and irrigation were determined. Almost half of 94 local wells surveyed had NO 3 À -N concentrations above the USEPA public drinking water maximum contaminant level of 10 mg L À1 . The data indicate that N inputs for intensively managed vegetable crops in northeast China should be reduced urgently to maintain crop yields while avoiding serious long-term environmental damage. #

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“…For this case study, the applied rates of nitrogen fertilization were around 220 kg N·ha −1 in most of the crop cycles. Although this rate remained within the range of previous indications for vegetable crops (e.g., 89 to 190 kg N·ha −1 for tomatoes [74], 145 to 344 kg N·ha −1 for lettuces [75,76], 180 to 600 kg N·ha −1 for cabbage [77]), the amount could result in significant leaching losses. Furthermore, the winter irrigation rate was larger than the expected rate in professional agriculture.…”

Section: Eco-efficiency and Crop Managementmentioning

confidence: 96%

Eco-Efficiency Assessment and Food Security Potential of Home Gardening: A Case Study in Padua, Italy

et al. 2018

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Abstract:In the expanding urban agriculture phenomenon in Europe, home gardens are a traditional form that have kept agriculture within cities, even becoming crucial in certain historical periods (e.g., war periods). However, horticultural practices in home gardens can also have negative consequences. The goal of this paper is to assess the eco-efficiency of home gardens as a type of urban agriculture. To do so, a case study in Padua (Italy) was evaluated following life cycle assessment and life cycle costing methods. A home garden of 30.6 m 2 and 21 crop cycles were evaluated. The functional unit of the assessment was 1 kg of harvested fresh vegetable at the consumption point, and the ReCiPe method was employed for impact assessment. Environmental assessment indicated that organic fertilization, use of tap water, mineral fertilization and pesticides were the most contributing elements of the entire life cycle. Furthermore, the relevance of garden design and crop selection was a determinant in the eco-efficiency results. The assessed home garden could satisfy the food requirements of between 1 and 2 members of the household. Crop management and design recommendations are provided to improve eco-efficiency and food security potential of home gardens.

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Nitrogen requirements of lettuce under sprinkler irrigation and trickle fertigation on a spearwood sand

Cited by 17 publications

References 15 publications

Rendimento e teores de macronutrientes em alface tipo americana em função de doses de nitrogênio e molibdênio em cultivo de verão

Rendimento e teores de macronutrientes em alface tipo americana em função de doses de nitrogênio e molibdênio em cultivo de verão

Environmental implications of low nitrogen use efficiency in excessively fertilized hot pepper (Capsicum frutescens L.) cropping systems

Eco-Efficiency Assessment and Food Security Potential of Home Gardening: A Case Study in Padua, Italy

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