Influence of multiyear mineral fertilization with accelerating doses of nitrogen, phosphorus and potassium on agrochemical characteristics of Hungarian cherry variety on grey forest soils (haplic luvisol, FAO)
2006
Lazarov, I. (Izpalnitelna Agentsiya po Sortoizpitvane, Aprobatsiya i Semekontrol, Sofia (Bulgaria))
Study was carried out on grey forest soil (Haplic luvisol, FAO). The soil was of low humus supply and low content of nitrogen and P205 and a little more K20. The soil type reaction was neutral to weak alkaline. The test variety was Hungarian cherry, including control and 12 variants with accelerating level of N, P, K fertilization in 13 year period.It was found alteration in respect to increased content of the mobile nitrogen forms in the soil. The ammonium nitrogen increased in autumn. The N-N03 migration in profile, for almost all of variants with N fertilization with statistically proved differences was established. It was proved positional accumulation of mobile form of P205 and K20 in profile 0-20 cm in variants with phosphorus and potassium fertilization.
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