Balance of nitrogen in the agriculture of baltasi municipal region of the republic of Tatarstan

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Abstract

On the basis of 45 years data, the economic dynamics of nitrogen balance was represented, calculated in four different ways, which are defined by correspondence of accounting of credit and debit articles of nitrogen balance. When calculating the balance according to the first embodiment, we limited by comparison of economic takeaway of nitrogen, including agricultural crops (excluding biological nitrogen fixation, including symbiotic) with the receipt of it as part of mineral and organic fertilizers. In the second embodiment of nitrogen balance calculation, the economic takeaway was calculated, taking into account the symbiotic nitrogen fixation, the dimensions of which were taken equal to 2/3 of the economic removal of nitrogen by legumes. In the following two variants of calculation the authors attempted to better reflection of credit and debit articles of nitrogen balance: precipitation leaching, losses due to soil erosion, loss of gaseous nitrogen, symbiotic and non-symbiotic nitrogen fixation, nitrogen in the delivery of seeds and precipitation, according to the recommendations, which differ only by different approaches to the calculation of the size of symbiotic nitrogen fixation. Regardless of the calculation method, the fluctuations in the dynamics of nitrogen balance were about the same and had a wavy character. Nitrogen deficiency in the cycle I changed to a surplus in the next four cycles (1971-1995), but the last three cycles characterized by a negative balance again. Such dynamics of economic nitrogen balance was mainly due to changes in the flow of nitrogen in fertilizer and takeaways with crops. The highest correlation was found between the first and third embodiments of the calculation (r = 0,994), which may give a more realistic economic dynamics of the nitrogen balance.

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