Crops productivity and changes in soil nutritional regime at different fertiliser systems
1999
Tomov, T. | Manolov, I. | Kostadinova, S. | Matev, Y. (Agricultural University, BG-4000 Plovdiv (Bulgaria))
The study on the influence of different fertilisation systems (1 - control, 2 - N300P300K400, 3 - N6000P300K400, 4 - N900P300K400, 5 - 40 t/manure per ha + N600P300K400, 6 - N600P0K400, 7 - N600P300K0) on crop productivity, nutrient element uptake by formed biomass and changes of soil available phosphorus and potassium forms in conditions of four seasons rotation (maize-wheat-maize-barly) has been made since 1988. The experiment included two consequence rotation. The established higer productivity of crops during second rotation was due to higher maize yields. The fertilization of crops with mineral and organic fertilisers increased productivity of rotation from 59 to 66% in comparison with the control. The excluding of phosphorus from the fertilising combination decreased productivity of wheat from 780 to 1340 kg/ha and from 500 to 1210 kg/ha for barly, as well as content of available phophorus in soil.
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