engleski

Response of maize to fertilization with KCl on gleysol of Sava valley area

Five maize (Zea mays L.) hybrids were grown for four growing seasons on gleysol characterized by moderate supply with potassium (K). Three rates of KCl were applied in four replicates at the beginning of April 2001 as follows (kg K2O/ha): 150 (control), 650 and 1400. The highest rate of KCl resulted in significant increases of yield of 14%, 24% and 12%, for 2001, 2002 and 2003, respectively ; while in the fourth year similar yields to the control were found. The OsSK552 and Bc5982 hybrids (4- year mean 8.70 t/ha) were more susceptible to soil stress in comparison with OsSK444 and OsSK458 (mean 9.07 t/ha). At the same time, Florencia hybrid yielded 9.37 t/ha. Four hybrids responded similarly to applied fertilization (yield increases from 13 to 16% in comparison to the control), while Florencia had low response to KCl (yield increase for 5% only). Under these conditions we recommend combined solution using 1000 kg K2O/ha every third year and a choice of tolerant hybrids.

potassium fertilization ; maize hybrids ; K-deficiency yield stalk lodging

nije evidentirano