Two field experiments were carried out during the two successive winter seasons of 2013/2014and
2014/2015 in a private sector farm at Kafr Elsohbi Village, Qalubia Governorate, Egypt to investigate
the effect of different levels of organic fertilizer (compost) at 35.7, 47.6 and 59.5 ton/ha. in presence of
mineral and bio fertilizers and foliar spray with salicylic acid (SA) at 200 ppm, putrescine at 200 ppm,
monopotassium phosphate at 2g/l and ascorbic acid at 200 ppm as well as their combinations on
vegetative growth characters, chemical constituents, total yield and quality of potato (Solanum
tuberosum L.) cv. Lady Rosetta during winter season. Obtained results showed that, fertilizing potato
plants with compost at different used rates significantly increased all measured vegetative growth
traits, chemical constituents of plant foliage, total produced tuber yield and its components, large and
medium size tubers as well as chemical constituents of produced tubers. However, it decreased nitrate
and total sugars percentage of produced tubers. Moreover, using the highest compost rate (59.5ton/ha.)
exhibited the highest values in all aforementioned traits. Also, spraying potato plants four times
starting one month from planting and every two weeks by interval with putrescine at 200 ppm and
monopotassium phosphate at 2g/l reflected the highest values of vegetative growth aspects and
chemical constituents of plant foliage as well as total produced tuber yield and its quality without
significant differences among them compared with other tested growth stimulants and the control. In
this respect, fertilizing potato plants grown under sandy loam conditions with compost at 59.5 ton/ha.
combined with spraying the plants four times with either monopotassium phosphate at 2g/l or
putrescine at 200ppm exhibited the highest values of total produced tuber yield and its components
with best quality. |
