Two field experiments were carried out during the two successive winter seasons of 2015/2016 and 2016/2017 in the privet farm at Vegetables Farm at meet Faris village Dekarns, Dakhlia Governorate to study the effect of magnesium as application methods, and calcium rates as foliar application and the interaction between them on growth, yield and quality of potato cv. Spunta under clay soil conditions using furrow irrigation system .Fertilized potato plants with MgSO 4 at 20 kg /fed. (SA) combined with 4% calcium chloride (FA) gave the highest values of plant height, number of leaves, leaf area/ plant and dry weight /shoot, N, P and K contents in leaves after 70 days form planting , number of tubers/plant, yield / plant and total yield/fed., dry matter, starch contents in both seasons without any significant differences with the interaction between MgSO 4 at 4 % (FA) and CaCl 2 at 2 or 4 % (FA) concerning the number of tubers/ plant in both seasons. While the interaction between MgSO 4 at 4 % (FA) and CaCl 2 at 4 % gave the highest values of Ca and Mg in tuber without any significant differences with MgSO 4 at 20 kg /fed. (SA) and CaCl 2 at 4 % (FA) in both seasons.In this regard, the increases in total yield/fed. were about 41.99 and 42.22 % for the interaction between MgSO 4 at 20 kg /fed. (SA) and CaCl 2 at 4 % (FA), followed by 34.19 and 33.52 % for the interaction between MgSO 4 at 4 % (FA) and CaCl 2 at 2 % (FA) than untreated plants in the 1 st and 2 nd seasons, respectively.

Two field experiments were carried out of the vegetable private farm at Kafr Meet Faris, Dakahlia Governorate, during 2017/2018 and 2018/2019 seasons to study the influence of planting dates (20 September, 5 October, 20 October and 5 November) either single and/or in combination with some NK-rates (100%, 110% and 120% from recommended rate) on plant growth, yield and its components, as well as chemical constituents and storability of bulbs on garlic Sids-40 cultivar. Results showed that, the Germination percentage and vegetative growth characteristics (plant height, number of leaves, plant dry weight and bulbing ratio) were better with the second planting date (5 October) followed by the third planting date (20 October) in both seasons. Moreover, total yield, bulb weight and diameter and average clove weight were increased with these planting dates. Whereas, the late planting date (5 November) gave the lowest values in both seasons. On the other hand, application of 120% NK-rate resulted in significant increases in most parameters compared with other treatments. Moreover, concentration N, P, K, TSS and volatile oils in cloves were significantly increased with this treatment. Also, this treatment was significantly reduced the weight loss percentages. The positive interactions between planting dates and NK-rates were often observed. The best results were obtained by the second planting date followed by the third planting date without significant differences between them in most cases combined with 120% NK-rate. Therefore, this treatment could be recommended for improving productivity, quality and storability of garlic under similar conditions to this work.

Abiotic stress as heat stress (extreme temperatures) cause unavertable conditions for plant growth lead to increase losses in yield and poor fruit quality. The intent of this study is to focus on the role of some bio-stimulants as soil application (fulvic and humic acuids, seaweed extract and phosphoric acid) on snap bean productivity under natural heat stress. The results showed that soil application with falvic acid (1 L/fed) markedly improved snap bean plants vegetative growth behavior, minerals content and photosynthetic pigments of leaves, yield and its quality in the two seasons. The lowest values of all the above mentioned parameters were observed with the control plants as a result of heat stress damages under the experiment conditions.

Two field experiments were carried out during the two successive winter seasons of 2015/2016 and 2016/2017 in a private farm at meet Faris village, Dekarns, Dakhlia Governorate, to study the effect of fulvic acid as application methods ( without, soil application at 4 kg /fed. and foliar application at 5 g / l) and some sources of potassium (potassium sulphate, potassium silicate, potassium chloride and potassium citrate) at 1% K 2 O as foliar spray and the interaction between them on growth, yield and quality of potato tuber cv. Spunta under clay soil conditions using follow irrigation system .Results indicated that, the interaction of fulvic acid at 4 kg/fed. as soil application (SA) with K silicate as foliar spray recorded the highest values of plant height, number of leaves and dry weights of potato plants. It also exerted superior recorded of N, P and K concentration in shoots and its uptake after 70 days from planting , number of tuber/ plant, yield (kg)/ plant and total yield ( ton) /fed., dry matter content in tuber, TSS, starch and K content in tuber at harvesting time. In this connection, it was followed by the interaction between fulvic acid at 5 g/liter as (FS) and silicate potassium in both seasons. Meanwhile, the lowest values of abovementioned traits were recorded with the interaction between treatments of fulvic acid non addition and spraying potato plants with K sulphate in both seasons.In this regard, the increases in total yield/fed. were about 38.90 and 45.14% for the interaction between fulvic acid as soil application and foliar application of K silicate, followed by 32.66 and 36.33 % for the interaction between fulvic acid as soil application and K citrate foliar application and 31.95 and 36.67 for the interaction between fulvic acid as foliar application at 5 g/l and K silicate foliar application than that plants which sprayed plants with K sulphate only in the 1 st and 2 nd seasons, respectively.