The researchers studied how applying different levels of amino chelate manganese on wheat plants affects their yield and quality. They tested four wheat cultivars in a field experiment and found that using a higher concentration of manganese led to increased grain yield, number of grains per ear, and overall plant weight. The wheat variety called pars had the highest grain yield among the cultivars tested. They also discovered that certain factors like spike length, number of grains per spike, and grain weight were closely related to the final grain yield.