Efficiency of different potassium and sulfur fertilizers on peanut (Arachis hypogaea) production in tropical sandy soil

In the sandy soil of Vietnam's South-Central Coast, peanut is a significant crop. The application of K and S needs to crops has recently attracted a lot of interest, especially for peanut. However, a comparison on the effects of different types of K and S fertilizers viz., ammonium sulphate (AS), superphosphate (SP), NPKS, potassium sulphate (SOP), and potassium chloride (MOP) is to be evaluated on the yield, quality, and K and S content in peanut seed. This study was conducted during winter spring and summer seasons 2019 - 2020 at Binh Dinh province (SCCVN). Equal rate of 75 kg K/ha and 30 kg S/ha was applied as SOP, NPKS and a mixture of AS, SP, MOP and these were compared against a control which applied nitrogen (N) and phosphorus (P) fertilizers. SOP application resulted in the highest yield (2.93 - 4.92 t/ha), protein (24%), lipid (53%) and seed K (0.19–0.53%) and seed S (0.57–0.69%). The study concluded that application of 75 kg K/ha and 30 kg S/ha in SOP fertilizer based on @ 8 tons of cattle manure + 40 kg N + 40 kg P + 500 kg lime/ha is suitable for peanut crop in SCCVN.