Impacts of Using Mineral Fertilization Combined with Sewage Sludge in the Amendment of Luvisol on Oat Crop I. Influence on Yield and Mineral Nutrition

Abstract

The present paper illustrates the results obtained on oat (Avena sativa L.), Somesan variety, concerning growth, grains and straw yields and also of macroelements accumulation (N, P, K, Ca, Mg) when various doses of sewage sludge were applied associated or not with mineral fertilization. Sewage sludge application produced significant increase of plant height starting with equivalent dose of 100 kg N/ha, meanwhile the highest height was observed in the case of plants fertilized with doses equivalent with 300 and 400 kg N/ha. With the increase of sewage sludge dose it has been observed the straw yield increase, this being statistically assured starting with sewage sludge equivalent dose of 100 kg N/ha. Sewage sludge fertilization, accompanied or not by mineral fertilizers, evidenced that nitrogen contents in oat grains increases with applied sewage dose, being significant from an equivalent dose of 200 kg N/ha. Low sewage doses equivalent with 200-300 kg K/ha evidenced for potassium concentration in oat grains a significant decrease in comparison with untreated variant, meanwhile mineral fertilization generated a significant increase of potassium levels in oat grains. Calcium contents in oat grains present a significant increase after sewage sludge fertilization and at a dose equivalent with 600 kg N/ha, the calcium levels (0.24%) increased 3 times in comparison with untreated variant (0.08%). Sewage sludge fertilization, associated or not with mineral fertilizers, did not produced significant changes of magnesium levels in oat grains, found concentrations being considered as normal values.

The Effect of Municipal Biosolids on the Growth, Physiology and Synthesis of Phenolic Compounds in Ocimum basilicum L.

“…The response of plants to fertilization with biosolids varies depending on the application method (on the surface or embedded in the soil), the chemical composition of the biosolids and the soil, the application dose and the cultivated species [ 1 ]. Application of biosolids as fertilizers contributes to the improvement in physicochemical properties of the soil by increasing the content of organic matter and nutrients (total nitrogen, mobile forms of phosphorus and potassium), increasing the water retention capacity, increasing the air spaces and reducing the density [ 7 ].…”

“…Soil erosion is a global problem that affects agricultural production capacity endangering food security in the context of population growth. The magnitude of this phenomenon is very high, being estimated at 35.9 billion tonnes per year for 2012, increasing by 2.5% in comparison to the level measured in 2001, mainly due to the change in land use destination [ 7 ]. The causes that lead to soil erosion are both natural, for example, erosion caused by rain and wind, and anthropogenic caused by deforestation or intensive agriculture.…”