Biological productivity and agrochemical parameters of smonitza under maize in different fertilization conditions
2007
Mandic, L., Agronomski fakultet, Cacak (Serbia) | Djukic, D., Agronomski fakultet, Cacak (Serbia) | Stevovic, V., Agronomski fakultet, Cacak (Serbia)
The aim of the investigation was therefore to examine the impact of increasing nitrogen fertilization rates (90, 120, and 150 kg/ha), of liquid and solid manure (80 t/ha and 45 t/ha, respectively) on the proteinase and dehydrogenase soil activities, basic agrochemical soil properties and maize grain yield. The experiment was set up on the smonitza type of soil. Maize (NSSC 640) was grown in a single-crop monoculture for three years. Mineral starter fertilizers were applied each year whereas the organic ones were incorporated into the soil prior to sowing only in the first year with the aim of determining their prolongated effect. The study results show that the enzymic activity of the soil depended on the type and rate of the applied fertilizers as well as on the time and zone of sampling. Namely, lower nitrogen fertilizer rate (90 kg/ha) caused a significant increase of the dehydrogenase and proteinase soil activities compared to the application of the highest rate (150 kg/ha), leading to a decrease in the activities, particularly in the maize edaphosphere. The solid manure, as opposed to the liquid manure, increased the activity of the enzymes mentioned, indicating its prolonged effect property. The highest nitrogen rate used resulted in the highest yield. However, bearing in mind the yield level achieved with the lower nitrogen rate and more favourable biochemical and agrochemical parameters of the soil investigated, the nitrogen rate of 150 kg/ha cannot be considered productive for this type of production.
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