Nitrogen and Potassium Uptake and Utilization of Four Grapevine Rootstocks

Abstract

Two pot experiments were carried out during two seasons of 2014 and 2015 on four grapevine rootstocks namely, Salt creek, Freedom, 1103 Paulsen and Harmony under shad (siran) house at pomology department, Fac. of Agric., Cairo Univ., Egypt. This study aimed to investigate the efficiency of previous rootstocks in uptake nitrogen and potassium nutrients as their effect on growth parameters. Four nitrogen and potassium rates (0.0, 0.4, 0.8, and 1.2 g N or K2O/pot) were added separately in the two separate experiments and each rate was divided into six equal doses which added weekly. Freedom rootstock recorded the highest growth vigor parameters with regard to shoot and root length and dry weight followed by Salt Creek rootstocks all along both experiments. Also, Freedom recorded the highest significant leaf area in the first season in both experiments. Moreover, Freedom rootstock contained the highest nitrogen and potassium content in shoot and root tissues. Furthermore, the highest nutrient dosages (0.8 and 1.2 g/pot) recorded the highest growth parameter, chlorophyll, nitrogen and potassium content. This study showed an additional advantage for Freedom rootstock in uptake and utilization of nitrogen and potassium nutrients.

Morphological, physio-biochemical and nutritional status as potential markers for grafting compatibility in Kalamata olive cultivar

“…Moreover, the lowest Na and Cl content and the highest N% and K% were recorded in Frantoio and Koroneiki rootstocks. Also, Freedom rootstock had efficiency to accumulate more nitrogen content than Paulsen rootstocks in grapevine [ 7 ]. Also, leaf nitrogen content (% dry weight) fell in the incompatible graft combination peach(Batsch)/plum (Myrobolan P18) 65 days after grafting [ 32 ].…”

“…The number of leaves were counted and then the leaf area was calculated according to Koubouris et al [ 18 ] from the seventh fully mature leaf from the tip of the stem (leaf area = 0.308 + 0.708* leaf length*leaf width). A Minolta portable chlorophyll meter was used to calorimetrically determine the amount of chlorophyll as a SPAD value [ 7 ].…”

Callusing soil of grafted grape cuttings as a positive feature for climate change

“…Grafting grapes using specific rootstocks has become a common practice widely spread throughout the world since the introduction of Phylloxera in some European countries in the nineteenth century (WHITING, 2012). Rootstock plays an important role in improving scion development, fruit quality and adaptation to different environmental conditions (ABDEL-MOHSEN;RASHEDY, 2015;ZOMBARDO et al, 2020). In Egyptian viticulture, Freedom rootstock is one of the most important grape rootstocks due to its resistance to nematodes, high nutrition use efficiency and vigor as well as being highly compatible with most of the cultivated grape varieties (ABDEL-MOHSEN and RASHEDY 2015;FAYEK et al, 2016).…”

Tuning Potassium Fertilization to Improve pH and Acidity in Glera Grapevine (Vitis vinifera L.) under a Warming Climate

“…The total K content in grape berries at harvest depends on different factors, such as the rootstock [7,8], the fertilization management [9,10] and also the climate conditions [11]. In the berry, K is involved in the neutralization of negative charges and can reduce the amount of free tartaric acid, forming potassium bitartrate and eventually affecting the final pH of the grape juice.…”