EFFECT OF LONG-TERM APPLE-TREE CULTIVATION AND CULTURAL PRACTICES IN THE ORCHARD AFTER REPLANTATION ON THE CONTENTS OF INDOLE-3-ACETIC ACID AND CHEMICAL COMPOUNDS

摘要

In this study effect of long-term apple-tree cultivation andcultural practices as fertilization and irrigation performed in the orchard afterreplantation on the level of indole-3-acetic acid (IAA), total organic carbon(TOC), hot water extractable organic carbon (C_(HWE)), total nitrogen(N-total), ammonium (N-NH_(4)~(+)) and nitrate (N-NO_(3)~(–))ions in the soil was investigated. In the experiment, three irrigation and threefertilization levels were used. The amounts of IAA, TOC, C_(HWE), N-total,N-NH_(4)~(+) and N-NO_(3)~(–) in soil almostalways depended on the sampling period. Between fertilized and irrigated combinationsoriginating from apple-tree orchard after replantation and Nowina there havenot been confirmed differences in the contents of indole-3-acetic acid, hot waterextractable organic carbon, N-total and ammonium ions. Plant cultivation formany years on the same site has not had a negative effect on the concentrationsof these parameters in the orchard. Furthermore, the concentration of total organiccarbon and yield of apple-tree cultivated after replantation was significantlylower, in comparison with locality after previous agricultural use (Nowina).The differences have been demonstrated in the amount of total organic carbon,hot water extractable organic carbon, N-total and pH among fertilized combinationsof soil in the apple-tree orchard after replantation. Moreover, different levelsof fertilizer had no significant effect on the content of indole-3-acetic acid,ammonium and nitrate ions in the soil and yield of fruits. The applied irrigationlevels (-0.03 MPa, -0.01 MPa) exert an significant impact on the decrease ofindole-3-acetic acid, hot water extractable organic carbon, ammonium and nitrateions in the soil and yield of fruits in replanted orchard.