Changes in the yield and some morphological characteristics of soybeans due to the application of ammonium nitrate

The pre-sowing application of ammonium nitrate provides plants with nitrogen in the initial stages of growth, prevents nitrogen depression during plant emergence and has a positive effect on the yield of cultivated plants. The pre-sowing application of larger amounts of ammonium nitrate in legumes can also have a negative effect, because it blocks the development and efficiency of nodule bacteria, which negatively affects the achieved yield and morphological characteristics of the plants. The influence of the pre-sowing application of different doses of ammonium nitrate on the yield and morphological characteristics of soybean plants was investigated during 2023 and 2024 on a private plot in Selenca, with the medium-sized soybean variety NS Apolo. The two-year results show that the pre-sowing application of ammonium nitrate of 100 kgha-1 statistically very significantly increased the yield of soybeans, the weight of one thousand grains, the number of grains per plant and the weight of grains per plant, while the application of ammonium nitrate in the amount of 300 kgha-1, compared to the application of ammonium nitrate of 100 kgha-1, statistically significantly reduced the yield of soybeans and the weight of one thousand grains, and compared to the control variant, it statistically significantly reduced the number of grains per plant and grain mass per plant and statistically significantly reduced the mass of one thousand grains. Excessive doses of ammonium nitrate can lead to a decrease in yield and negatively affect the morphological characteristics of soybean plants.