Response of growth and chemical composition of quercus robur, l. seedlings to organic and inorganic fertilizers

الملخص EN

This research aims to create a method for increasing the growth of Quercus robur, L seedlings, therfore pot experiment was conducted to study the response of growth and chemical composition for Quercus rubra seedlings to organic (potassium humate 5 or compost tea 15 cm³ /seedling) and inorganic fertilizers 50% (NPK at 15g/seedling), 75% (NPK at 22.5g/seedling) and 100 % (NPK at 30g/seedling)in the Experimental Farm of Horticultural Research Station of El-Kanater El-Khyria, Qaluobia Governorate, Egypt throughout two successive seasons of 2017/2018 and 2018/2019.

The obtained results indicated that the significant values of increment height growth, stem diameter, root length, biomass fresh and dry weight declared as a result to apply the treatment of 50% NPK mineral plus compost tea 15 cm³ and K-humate 5 cm³/seedlings followed by those of 75% NPK +compost tea the intermediate values were exhibited with applying 75% NPK +compost tea or 75% NPK +K-humate and the latest in ranking was control, meaning that applying 50% NPK plus compost tea and K-humate produced the superior seedlings more than the others.

So it can be saved mineral nutrients by applying organic nutrients.

Similar trend approximately revealed with total chlorophyll but total carbohydrates in stem pronounced the highest value with the treatment of compost tea alone.

Concerning the content of N, P and K levels in plant it can be observed that a different values were occurred due to utilizing organic or inorganic nutrients and there is no clear trend and insignificant differences among the treatments.

However N, P, K slightly increased with adding NPK at the different levels + compost tea or K-humate.

It can be recommended from the above mentioned results that adding half dose of inorganic nutrients as 50% NPK alongside compost tea and K-humate represented organic nutrients enhanced soil conditions led to producing healthy seedling of Quercus robur and reducing the doses of NPK as mineral nutrients.