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.

Determination of Phosphorus Fertilizer Dose for Rice Using Mitscherlich-Bray Equation

“…Based on this scenario (R = 0.2, p = 0.008), the fertilizer P rates for aerobic rice calculated estimated to be 68.2, 62.8 and 57.3 kg ha -1 if the soil test value was 10, 15 and 20 kg ha -1 , respectively. This suggested that there is a dire need of site-specific nutrient management system rather than the generally adopted general recommendations that is made for large areas [13].…”

Sunflower-nitrogen calibration based on the amount of mineral nitrogen in soil under rainfed conditions in thrace region

“…It has been reported that the Mitscherlich-Bray equation [log(A-y) = logA-c1b1-cx] can be used for the Mitsherlich calibration equation, depending on the relationships between the KCl-extractable NO3-N content in the soil and the yield (Bray, 1945;Afzal et al, 2014, Sonar and Babhulkar, 2002, Ali et al, 2022. In this study, it was aimed to obtain the relationship between the amount of NH4 + NO3 -N extracted with KCl and the yield for the sunflower plant under rainfed conditions in Thrace Region, using the Mitscherlich-Bray equation.…”