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Effects of the NPK–Silicon Interaction on Growth Indices of Aubade Ryegrass (Lolium sp.)
The high-Andean region of the department of Nariño relies on livestock farming as its economic mainstay, an activity characterized by the production of improved forage crops such as Aubade ryegrass (Lolium sp.), which is known for its high productivity and nutritional quality. However, to reach its full productive potential, it requires an efficient supply of nutrients and water. This study evaluated different levels of NPK in interaction with silicon on growth indices (TCA, TCR, TAN) and leaf area index (LAI). The study was conducted at the Chimangual experimental farm of the University of Nariño (Sapuyes), located at 3,154 meters above sea level with an average temperature of 10°C and an average annual precipitation of 1,200 mm. A randomized block design was established to evaluate three levels of NPK (381-156-89, 286–117–67, and 190–78–44 kg ha⁻¹) in interaction with four levels of Si (100, 75, and 50 kg ha⁻¹) and a control (0 kg ha⁻¹), for a total of 12 treatments. The results indicated that the NPK/Si interaction did not have significant effects on growth indices or on the leaf area index (LAI). However, it was determined that these variables were significantly influenced by the different NPK levels, particularly the 381-156-89 kg ha⁻¹ NPK level. These results suggest that ryegrass growth indices depend primarily on NPK availability, while silicon does not enhance its effect on these specific variables.
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