Micr effect of mineral treatments and planting dates on growths, yield and fatty acid composition of peanut oil (arachis hypogaea l. )‎ new variety Sohage 107

الملخص EN

The objectives of this investigation were to evaluate the effects of different planting dates (1 May, 16 May and 1Jule) and spraying Si (100 ppm) or Se (50 ppm) 4 times on the growth characters and yield as well as the physico-chemical characters and Fatty acids compositions of peanut oil.

Two field experiments were conducted at Shandweel Farm (Sohage governorate, Egypt) in 2016 and 2017, using the new local namely var.

Sohage 107 (Arachis hypogaea L.

).

Results showed that early sowing (1May) resulted in significant increases in plant height and no.

of branches /plants.

Si or Se applications produced significant increases of branches /plant of late sowing (1 June) compared to control one.

Results showed also that no.

of Pods/plant, 100-seed weight (g), Pods/plant (g) and Pod yield (Kg fed^-1) were the lowest values at late sowing date.

However, Si or Se foliar applications improved the previous characters and increased dry matter production.

Oil content ranged from 54.75% to 59.15% , the lowest oil content was found in seeds of plants sown late.

No significant differences in RI (1.465-1.469) were found according that plant dates or mineral treatments.

The highest acidity (2.46% ) was recorded in plants sown late.

Se application reduced the peroxide values in oils of plants sown late.

The lowest IV was obtained in oils of plants sown early (87.70).

Oil contained oleic acid as a major MUSFs (54.8-59.07% ) and Palmitic acid as a major SFAs.

The lowest value of oleic acid was obtained in plants sown late, while the highest value of linoleic acid was produced in plants sown late and sprayed with Si or Se.

The highest O/L ratio accompanied with lower IV were obtained in oils of plants sown early and sprayed with either Si or Se (2.27-2.33 O/L ratio and 88.30-91.71 IV).

The opposite was true with plants sown late.