Abstract
The organic fertilizers’ application and the traditional use for long periods of time have influenced the rich plant diversity in Apuseni Mountains, Romania. The objective of this study was to identify the effect of manure’s application upon the plant diversity and productivity of Festuca rubra L. –Agrostis capillaris L. grasslands. The experimental field evaluated four variants (V1: control, V2: 10 t ha-1 manure, V3: 20 t ha-1 manure, V4: 30 t ha-1 manure). After ten years, important changes at the sward level were observed. The control’s phytocenosis is naturally represented by Festuca rubra L. - Agrostis capillaris L. grassland type. Then, following the application of organic fertilizers, Trisetum flavescens L. - Agrostis capillaris L. appeared. The large quantities of organic fertilizers produced a considerable limitation on plant diversity. The applied treatments do not produce any important improvement of the grassland types’ agronomic value. Taking account the influence of organic fertilizers upon the DM yield, plant diversity and agronomic value, it is considered that the treatment with 10 t ha -1 manure annually applied produces optimum changes and might be taken into consideration for the low-input systems in Apuseni Mountains
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