1,721,056 research outputs found
Influence of storage temperature, tuber size and nitrogen nutrition on the content of vitamin C in potato
No full textIn 2002 some experiments were carried out on potato of the cv. 'Desiree' with the aim to evaluate the influence of storage temperature (5°C, 24°C), nitrogen nutrition (0, 140, 300, 600 kg/ha) and tuber size on the L-Ascorbic acid content, chemically measured by HPLC analysis and by histological studies by silver nitrate staining technique to locate its presence. The evolution of the content of the organic acid in the buds located on the rose end and on the lateral eyes of the tubers was effected during the storage period. The results underlined that, during the storage period, the L-Ascorbic acid content of potatoes decreased, during the first storage phases in the tubers stored at 24°C. Nitrogen fertilisation caused the reduction in the content in L-ascorbic acid, with 20% of concentration in the tubers treated, compared with non fertilised control. Little was the influence of the tuber size on the L-AsA content. The study on the evolution of the L-ascorbic acid content in the buds of the eyes underlined the increase of the content in L-ascorbic acid 33 days after harvesting, suggesting possible involvements of this organic acid during the dormancy period of the tuber
Physiological, Productive and Qualitative Aspects of Potato in Early and Late Cycles
No full textIn ltaly, characterised by different pedo-climatic conditions, annual potato covers an area of 80,000 ha and produces 2 million tons. The diversified climatic conditions of our country allow its cultivation in different cycles, spring-summer in the Centre and North, winter-spring (Early potato) and summer-autumn (Late potato) in the South. The two last cultivation cycles are defined 'extraseasonal' and cover a surface of over 24,000 ha, equal to 44o/" of the total Italian potato surface, and have a remarkable commercial importance for exports. The different growing conditions (in early and late cycles) induce different characteristics in the product. A study on six potato varieties, in early and late cycles was conducted in 2003 to test the influence of different environmental conditions on potato. The analyses concerning the physiological (LAI, SPAD), productive (total and marketable yield, tubers per plant and tuber weight) qualitative (dry matter, fry colour ACB scale), and compositional (K, Ca, S, Mg, Fe, Vitamin C) parameters showed the influence of the variable environmental condition on the yield, physiological behaviour of the plant and the compositional characteristic of the tubers
Physiological, productive and qualitative aspects of potato in early and late cycles
No full textIn Italy, characterised by different pedo-climatic conditions, annual potato covers an area of 80,000 ha and produces 2 million tons. The diversified climatic conditions of our country allow its cultivation in different cycles, spring-summer in the Centre and North, winter-spring (Early potato) and summer-autumn (Late potato) in the South. The two last cultivation cycles are defined 'extraseasonal' and cover a surface of over 24,000 ha, equal to 44% of the total Italian potato surface, and have a remarkable commercial importance for exports. The different growing conditions (in early and late cycles) induce different characteristics in the product. A study on six potato varieties, in early and late cycles was conducted in 2003 to test the influence of different environmental conditions on potato. The analyses concerning the physiological (LAI, SPAD), productive (total and marketable yield, tubers per plant and tuber weight) qualitative (dry matter, fry colour ACB scale), and compositional (K, Ca, S, Mg, Fe, Vitamin C) parameters showed the influence of the variable environmental condition on the yield, physiological behaviour of the plant and the compositional characteristic of the tubers
Influenza di tecniche agronomiche sulla potenzialità produttiva del lino da fibra in alcune località della Basilicata
No full textThe Effect of Tillage on Faba Bean (Vicia faba L.) Nitrogen Fixation in Durum Wheat ((Triticum turgidum L. subsp. Durum (Desf))-Based Rotation under a Mediterranean Climate
Full text linkBiological nitrogen fixation (BNF) is a sustainable approach to improving soil fertility that not only provides nitrogen to subsequent crops but also reduces the impacts of synthetic fertilizers. Here, a field experiment was established within the faba bean (Vicia faba L.), cv Prothabat 69-durum wheat (Triticum turgidum L. subsp. Durum (Desf)), cv Iride rotation framework of a long-term experiment in southern Italy to quantify BNF over two consecutive years (2012/13–2013/14). The effect of tillage systems (reduced, conventional, and no tillage) on faba bean N2 fixation was estimated at the flowering and maturity stages via the natural abundance technique, using wheat as a reference crop. The effect of tillage on the percentage of nitrogen fixation from the atmosphere (Ndfa) and the amount of N2 fixed (kg ha−1) were higher under a no-tillage system in both years and at both growth stages, with values of 66.5% at flowering and 81.7% at maturity. The same trend was reported for the amount of N2 fixed (kg N ha−1) at both faba bean growth stages. The N balance was positive in both years, with a mean value of 40.4 kg N ha−1, across all tillage systems; this value was greater in the no-tillage systems (45.7 kg N ha−1) with respect to the others. The values for the organic matter content and stability index were higher under the no-tillage system, which provided favourable conditions that improved N2 fixation by faba beans. The overall results indicate that no-tillage soil management represents a sustainable strategy for improving soil quality and fertility, therefore reducing the dependency of agriculture on synthetic fertilizers
Effects of Septoglomus viscosum inoculation on biomass yield and steviol glycoside concentration of some Stevia rebaudiana chemotypes
No full textThere is growing interest in the medicinal properties of Stevia rebaudiana Bertoni, due to its ability to produce zero-calorie sweeteners, steviol glycosides (SGs). Inoculation of the roots with arbuscular mycorrhizal fungi (AMF) is a method used to improve the production of secondary metabolites by many plant species, but its effects on S. rebaudiana have not been extensively studied, especially in open field conditions in Italy. Therefore, a field experiment was conducted to study the effects of the fungus Septoglomus viscosum on the leaves and secondary metabolites of three micropropagated stevia chemotypes (L1, L2 and L3) over three years. Our results indicate that the establishment of symbiotic relations between AMF and stevia plants of selected chemotypes improved leaf yield, because the mycorrhizal (MIC) treated plants had a better tendency to regrowth, especially L1 and L3, which had survival rates of 80 % and 90 %, respectively. MIC treatment also had positive effects in terms of SG production, which was not significant in terms of concentration, but was significant in terms of production
Implications of no-tillage system in faba bean production: Energy analysis and potential agronomic benefits
Full text linkBackground: Given the nutritional value of faba bean, however its susceptibility to water deficit, especially in Mediterranean environment, tillage practices need to be modified in order to adapt the crop to dry and low rainfall conditions and promote the interest in its cultivation. Objective: To identify whether no-tillage system can be considered as a sustainable means in faba bean cultivation under Mediterranean condition. Method: The study was conducted during a 6-year period (2010/11 to 2015/16) in southern Italy within wheat-faba bean rotation framework of a long-term experiment. The effect of No-Tillage (NT) on agronomic and energy parameters of faba bean (Vicia faba L.) cultivation was evaluated and compared to those of Conventional (CT) and Reduced (RT) Tillage. Results: The agronomic results indicate that NT performed better and/or is comparable to CT, while its application was 28% and 30% more energy efficient compared to CT and RT respectively. For agronomic parameters, tillage had a significant effect on number of plant m -2 , grain yield, grain protein content and 100-seed weight whereas year effect was significant for yield components and quality parameters. Energy indexes, instead, were significantly affected by both factors. NT gave the best results in terms of energy efficiency, energy intensity and net energy, and consumed 39% and 36% less non-renewable energy than CT and RT, respectively. Conclusion: Our findings revealed that the key benefit of NT in rainfed faba bean is its ability to produce sufficient yield of high quality with a significant reduction in energy inputs entailed the fewest field operations and therefore lowest energy requirements
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