Application of Mitscherlich–Bray Equation for Fertilizer Use on Raya

Abstract

Raya (Brassica juncea L.) as an imperative oilseed crop, necessitates a judicious amount of fertilizers for its sufficient yield, however the soils in Pakistan are becoming nutrient scarce owing to extensive farming. In order to evaluate the accurate fertilizer requirement for potential raya yields, an experiment was conducted at Regional agricultural research institute, Bahawalpur, Pakistan during the years 2018-2020. Various combinations of NPK fertilizers were made and applied to Raya crop. The treatments were T1 (0-0-0 NPK kg/ha), T2 (0-60-60 NPK kg/ha) ,T3 (60-60-60 NPK kg/ha), T4 (90-60-60 NPK kg/ha), T5 (120-60-60 NPK kg/ha), T6 (90-0-60 NPK kg/ha), T7 (90-30-60 NPK kg/ha), T8 (90-90-60 NPK kg/ha),T9 (90-60-0 NPK kg/ha), T10 (90-60-30 NPK kg/ha) and T11 (90-60-90 NPK kg/ha). Subsequently, fertilizer recommendations were made on the basis of Mitscherlich-Bray equation. Theoretical maximum yield of Raya was obtained by plotting log y (grain yield) versus 1/x (amount of nutrient applied). The results showed that Soil have 10 kg (P ha?1) would need 125 kg Phosphorus oxide per hectare fertilizer to attain 90% grain yield. Moreover it was concluded that recommended dose of fertilizer for Raya was less in comparison to that achieved through application of Mitscherlich-Bray equation. From these results, it is crucial to assess the 90%maximum yield by implementing the formula prior to conducting of field trials in order to enhance economic outputs and to balance the nutrients in soils.