Soil nutrient dynamics on soddy podzolic loamy sand soil in organic 6-field rotation | Augsnes barības vielu dinamika velēnu podzolētā mālsmilts augsnē bioloģiskā sešu lauku augsekā
2017
Zarina, L., Latvia Univ. of Agriculture, Priekuļi, Priekuļi parish, Priekuļi Municipality (Latvia). Inst. of Agricultural Resources and Economics
To clarify if theoretically compiled rotation ensures soil fertility after a full cycle of rotation, the dynamic of main nutrients was studied at the Institute of Agricultural Resources and Economics during the period 2001–2008. The experimental field is located ca. 123 m a.s.l., 57°19′ N, 25°20′ E. The crop rotation is as follows: spring crops with clover, clover, winter crops, potatoes, spring crops, and crucifers for green manure. Soil samples were taken in autumn after harvesting and the content of nutrients was determined by the State Plant Protection Service of Latvia according to the standard methods (http://www.vaad.gov.lv/UserFiles/ file/ZM_kartibas_AAI.pdf). Soil pH did not change significantly during the full cycle of rotation. Data on the main macronutrients shows a decreasing trend of all the fixed indicators through the 6-year period (Figure 1). The sharpest nutrient reduction was registered in the period following growing of cereals and potato. Following the incorporation of green manure the situation improves next year, but does not compensate fully. Taking into account that the long-term fertility of soils can only be maintained if the output of plant nutrients is compensated with a comparable input, the proven crop rotation cannot maintain full-fledged soil fertility over a long period. Theoretically, compiled rotation (spring crops with clover, clover, winter crops, potatoes, spring crops and crucifers for green manure) ensures the necessary content of Mg and Cano after a full rotation cycle on soddy podzolic soils, but it does not ensure the right amount of P2O5, K2O and S-SO4.
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