Abstract
The aim of this investigation was to estimate the effects of different amounts of nitrogen on the grain yield and nutritive value in two soybean genotypes (Laura and Lana). Studied varieties belong to different maturity groups (Laura is in the group I, while Lana is in the group II) and they both have reduced content of Kunitz trypsin inhibitor (KTI). Four treatments of fertilization were tested: 0 kg N ha-1, 30 kg N ha-1, 60 kg N ha-1 and 90 kg N ha-1. Field trials were carried out in dry land farming, at location Putinci, during the years 2008 and 2009. In both research years, variety Lana had higher grain yield and oil content then variety Laura. Method of nitrogen fertilization has been proved as an effective tool for increasing of grain yield and protein content in both varieties. The results of the study showed that application of 90 kg N ha-1 increased the grain yield and protein content of soybean more than application of other treatments (0, 30 and 60 kg N ha- 1). All nitrogen fertilization levels decreased the oil content.
Highlights
As the main source of vegetable protein, soybean plays an important role in the world of animal feed and food production
Research by Starling et al (2000) of soybean following corn in southern Alabama showed that plant growth and grain yield were higher when fertilizer N was applied as starter
One of the limitations to an increased use of grain legumes as feed is the presence of diverse compounds in their grain, commonly referred to as anti-nutritional factors, that both decrease nutritive value of grain legumes and, if taken in larger amounts, cause health problems that may be fatal for animals (Mikić et al, 2009)
Summary
As the main source of vegetable protein, soybean plays an important role in the world of animal feed and food production. Živanović et al (2000) obtained the highest grain yield of soybean at the level of 100 kg N ha-1, as well as with inoculation so without inoculation, and the lowest in variants without fertilization and inoculation. Laura and Lana are soybean genotypes with reduced content of KTI (Srebrić et al, 2008). This trait makes them suitable for direct feeding in adult non-ruminant animals without previous thermal processing (Glamočlija, 2004; Ranđelović et al, 2009). Perić et al (2009) reported that application of 60 kg N ha increased the protein content more than application of treatments 0, 30 and 90 kg N ha-1 The aim of this investigation was to estimate the effects of different amounts of nitrogen on the grain yield, raw protein and oil grain content in two soybean genotype (Laura and Lana)
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