The effect of struvite fertilization (Crystal Green) on the nutritional value of soybean

Abstract

One of the main factors considered in assessing the nutritional value of feed is its chemical composition that can be modified by fertilization. Faced with shortening P resources, we are looking for alternative sources of this element. Phosphorus is an essential nutrient in soybean cultivation. Aim of the study was to use alternative source of phosphorus fertilizater compared to traditional one on chemical composition of soybean seeds in a range of nutritional value in animal nutrition as well as basic content of macro- and microelements. Pot experiment with soybean Abellina variety was conducted at the Experimental Station of the Wroclaw University of Environmental and Life Sciences comprising two factors: phosphorus fertilizer placement (band, broadcast) and different phosphorus fertilization against the control. Use of struvite (Crystal Green) caused positive changes in selected aminoacids content and in nutritional value of protein in soybean seeds, what can enhence the value of soyabean seeds as well as increase of some of macroelements and microelements. Phosphorus fertilizer increased significantly the content of lysine, leucine, valine, phenyloalanine and tyrosine. Band fertilization with struvite caused a significant increase in amino acids (lysine, leucine, valine, phenyloalanine and tyrosine) as well as nutritional value of protein (Essential Aminoacid Index, Protein Efficiency Ratio and Biological Value of the Protein). Favorable changes under the influence of the application of struvite were recorded in the content of calcium, as well as phosphorus, iron and manganese. Value of the struvite in case of use as phosphorus fertilizer is promising however needs further study.