RESEARCH REGARDING THE UNBALANCED NUTRITION APPEARCE IN LONG TERM FIELD EXPERIMENTS WITH CHEMICAL FERTILIZERS PUBLISHEDGheorghe Ciobanu, Cornelia Ciobanu, Adrian Vuşcan, Corina Cosma, Gheorghe Tirpe
The paper presents the effect unbalanced nutrition because of long term chemical fertilization application. Nitrogen fertilizers application in different phosphorus backgrounds influenced differentiate the pH and mobile aluminum soil content values, chemical indexes with large effect on plant nutrients availability. The nitrogen and phosphorus fertilizers application determined progressive decreasing of pH values and increasing of mobile aluminum content in preluvosoils conditions. The pH-values after 30 years by nitrogen application decreased from 6.27 to 5.36 on unfertilized phosphorus background and from 6.03 to 4.98 in the case of P 160 phosphorus background fertilized. The mobile aluminum soil content because of long term nitrogen application increased with values ranged between 1.5 and 6.07 mg/100g soil in function of phosphorus background utilized. The data presented show that the pH and the mobile aluminum soil content is also depending on the mobile phosphorus soil content because the higher level of phosphorus determine bigger yields respective bigger nutrients consumption with cause soil debasification.
unbalanced nutrition; mobile aluminum; pH; nitric phytotoxicity; yield level