Efficiency of application of graded rates of mineral fertilizers for spring rape on sod-podzolic low loamy soils with different degree of erosion
2015
Tsybulko,N.N. | Punchenko,S.S.
In a course of the research there was studied on cespitose and podzolic sandy loam soils of different degree of erodibility application of the differentiated doses of nitric, phosphoric and potash fertilizers under a summer colza (Brassica naapus). As a result of research it was revealed that on not washed away soil the greatest net income of 3298 thousands of Belarusian rub/ha and profitability of 165% provided application of N110P30K60. It was found that on non-eroded soil the greatest net was 3 298 thousands of Belarusian rub/ha and application of N110P30K60 provided 165% profitability. Economic efficiency of chemical fertilizers on erodible soils is lower than on non-erodible soils. On middle-eroded soil N120Р40К70 application was the most efficient - net income was 3017 thousands of Belarusian rub/ha and the profitability was 132%. On highly-eroded soil the doses of N130P50K80 provided the greatest net income (2275 thousand rub/ha), while N130P30K60 doses provided the highest profitability. In agricultural landscapes with short slopes and the preponderance of the upland part over the slope it was reasonable to apply mineral fertilizers in an average recommended dose for culture without considering relief elements or degree of soil erosion. In the landscaped massifs with long and medium-long slope and parity of upland and slope parts, as well as the preponderance of the slope over the upland, it was more efficiently an application of differentiated according to the degree of soil erosion doses of nitrogen fertilizer, but phosphate and potash fertilizers – in doses, calculated on the positive balance of macronutrients, depending on the availability of soil varying degrees of erosion.
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