Quality Parameter and Chemical Composition of Spinash Plant as Affected by Mineral Fertilization and Selenite Foliar Application

Abstract

FIELD experiment was carried out at the Experimental Farm of the Faculty of Agric., El-Mansoura Univ. during season 2015, arranged in split block design with 3 replicates to evaluate the effect of 3 rates of NPK treatments (50, 100 and 150 % from recommended dose) as main plots and 4 levels of sodium selenite in a foliar way (0, 10, 20 and 30 mg kg-1) as sub plots. Results indicated that NPK fertilization up to 100 % under study significantly increased the average values of chlorophyll, fresh and dry weight, and total content of N, P and K as well as soluble and insoluble oxalate concentrations in spinach leaves as compared to the untreated plants. More addition of sodium selenite foliar application of sodium selenite at the lowest rates of 10 and 20 mg L-1 significantly increased the aforementioned traits while at the highest rate (30 mg L-1) significantly reduced the average values of all the previously mentioned traits. Also, the results indicated that, the mean values of total phenolic compounds, Se accumulation in leaves as well as the activity of nitrate reductase enzyme were significantly increased with the level of sodium selenite increasing. Such effect was realized under all the forms of NPKfertilizers. An adverse effect happened for the values of nitrate and nitrite accumulation in spinach leaves. It decreased sharply and significantly with increasing selenite level under all the investigated treatments. Obtained results proved that the foliar application of sodium selenite at the lowest levels (10 and 20 mg L-1) in combination with soil application of combined with NPK fertilization up to 100% is considered to be the most suitable treatment for all previous traits.

The Role of Different Nitrogen Sources Combined with Foliar Applications of Molybdenum, Selenium or Sucrose in Improving Growth and Quality of Edible Parts of Spinach (Spinacia oleracea L.)

“…For the shoot vitamin C content, only the treatment with 10 ppm Se resulted in a significant increasing in the 1 st season, while an increasing were observed in both treatments of 10 ppm Se and 100 ppm Mo in the 2 nd season (Table 4 and 5). Such results were supported by the finding of Fouda (2016), who reported that the foliar application of Se caused a significant increase of vitamin C in spinach plants.…”

“…Also, Se as a trace mineral was shown to affect multiple physiological and biochemical processes in different plant species (Moussa et al 2010). In previous studies, it has been observed that foliar application of Se increased the plant growth and yield in lettuce (Simojoki, 2003) and spinach (Fouda, 2016). Several studies reported that Mo nutrition enhances the growth and yield of leafy vegetables comparing with Mo deficiency conditions (Kaiser et al 2005;Moncada et al 2018).…”

“…The effects of Suc on the oxalate contents in plant were scarcely reported in the literature. However, some studies showed that the foliar application of Se increased the levels of soluble, insoluble and total oxalate in spinach (Fouda 2016;Sakara 2016).…”

“…The process of N assimilation in plants, in particular the reduction of NO3to NH4 + , and what follows, plant growth and the quality of yield, can all be affected by the foliar nutrition with molybdenum (Mo), sucrose (Suc) or selenium (Se) (Hesse et al 2003;Smoln and Sady 2012;Fouda et al 2016;Lei et al 2017). These nutrients can presumably reduce the contents of NO3 -, through enhancing NO3reduction process in leafy vegetables such as spinach (Fouda et al 2016), lettuce (Lactuca sativa) (Lei et al 2018), curly endive (Cichorium endivia) (Moncada et al 2018) and radish (Raphanus raphanistrum) (Smoln and Sady 2012).…”

Influence of Varieties and Nutrient Levels on Growth, Yield and Profitability of Palak (Beta vulgaris var. Bengalensis)

“…Phosphorous promotes healthy root growth. Phosphorous also has vital importance in increase plant height, better root, development and also improve the yield of Indian spinach [5]. Potassium activates plant physiology, improves fruit quality, increase disease resistance, prevents lodging and makes the plant capable of surviving moisture stress.…”