Potato tubers contamination with nitrate under the influence of nitrogen fertilizers and spray with molybdenum and salicylic acid

Abstract

A field trial was conducted through 2015 and 2016 growing seasons to study the effect of nitrogen fertilizer sources and foliar spray with molybdenum (Mo), salicylic acid (SA) and their combination on tubers yield, some chemical constituents, nutrients uptake, nitrate accumulation and nitrate reductase activity in potato tubers. N source was added at a rate of 350 kg N hain five equal doses as two different forms, the first is urea and the second is ammonium sulfate plus calcium nitrate equally. SA was sprayed with three rates of 0, 75 and 150 mg l. Also, Mo as ammonium molybdate was sprayed using three rates 0, 50 and 100 mg lMo. Both treatments of SA and Mo were applied separately as well as with each other, at three successive times 30, 50 and 70 days after planting of potato plants. Results indicated that the addition of 350 kg N ha as ammonium sulfate and calcium nitrate equally caused a significant elevation (P > 0.05) in fresh weight, chlorophyll b, carotenoids, chlorophyll a, nitrate reductase activity, dry weight and NPK uptake by potato tubers compared with the same amount of nitrogen in the form of urea only. All the aforementioned characteristics were improved with increasing concentration of Mo and/or SA. The highest accumulation of nitrate was recorded under the addition of 350 kg N ha as urea alone. The highest average of all the aforementioned characteristics was observed at the treatment of 350 kg N ha as ammonium sulfate and calcium nitrate equally plus spraying with 100 mg lMo and 150 mg l SA. In contrast, this treatment gave the lowest accumulation of nitrates in potato tubers.

Physiological and Biochemical Mechanisms of Exogenously Applied Selenium for Alleviating Destructive Impacts Induced by Salinity Stress in Bread Wheat

“…It diminishes the negative impacts of ROS and boosts plant tolerance by diminishing the detoxification of ROS produced due to salt stress [85]. Moreover, proline improves plant antioxidant systems [86,87]. Chandrashekar and Sandhyarani [88] reported that proline accumulation assisted plants to recompense energy and increased their survival under salinity stress.…”

Impact of wastewater discharge on the plant diversity, community structure and heavy metal pollution of range plants in eastern Saudi Arabia

“…Heavy metal caught more attention because of their long persistence in soil and cause extremely toxic effects on both the production of crops and on human health due to consumption of crops ( Abdo et al, 2020 , Bharwana et al, 2013 , Elrys et al, 2020 ). It is well known that Heavy metal toxicity in the environment cause significant toxic effects on plant processes including depression on seed germination ( Reddy et al, 2005 ), disorders in mitosis ( Liu et al, 1994 ), induction of leaf chlorosis ( Wierzbicka, 1994 ), root shoot growth reduction ( Elrys et al, 2018 , Elrys et al, 2019 ), enzyme activation and inhibition ( Van-Assche, 1990 ).…”

Callus induction and regeneration in sugarcane under drought stress

“… Balibrea et al (1999) also obtained variation in proline content associated with plant tolerance and ability to adapt to saline conditions. Besides, the high accumulation of proline is often associated with sugarcane, which is more salt-tolerant than unselected ( Gandonou et al, 2005 , Elrys et al, 2018 , Sitohy et al, 2020 ). The trend of our results confirms the findings of Cano et al (1996) who reported high proline accumulation in stress-resistant genotypes as compared to stress-sensitive ones.…”