Vol. 12, Issue 6 (2023)

Author(s):
Nagesh R Navghare, AB Age, SD Jadhao, OS Rakhonde and MR Pandao

Abstract:
The objective of this study was to investigate the impact of different levels of phosphorus on soil fertility, phosphorus use efficiency, and seed cotton and stalk yield after harvest of cotton. The study was conducted at the Research Farm, Cotton Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, during the kharif season of 2021-2022. The experiment followed a Randomized Block Design with eight treatments replicated three times. The recommended dose of fertilizer 120:60;60 NPK kg ha^-1 was applied to each treatment. The cotton variety PDKV JKL116 was used for the investigation, and Nano DAP was applied at seed treatment and foliar application at 30 DAS according to the treatments. Soil and plant samples were collected and analyzed using standard procedures. The results showed that the highest seed cotton and stalk yield was recorded with 100% NPK application. Inorganic phosphorus fractions (Ca-P, Al-P, and Fe-P) were significantly higher with 100% NPK, which was comparable to N75 P75 K100+ Nano DAP (ST @ 5 ml/kg seed & FS @ 0.2% at 30 DAS). The highest value of total organic phosphorus was also recorded with 100% NPK, which was comparable to N75 P75 K100+ Nano DAP (ST @ 5 ml/kg seed & FS @ 0.2% at 30 DAS). The highest phosphorus use efficiency was recorded with the application of N50 P50 K100 + Nano DAP (ST @ 5 ml/kg seed & FS @ 0.2% at 30 DAS). The available nitrogen, phosphorus, and potassium were significantly higher with 100% NPK, which was comparable to N75 P75 K100+ Nano DAP (ST @ 5 ml/kg seed & FS @ 0.2% at 30 DAS). The application of 100% NPK slightly improved pH, EC, OC CaCO₃, available S, Zn, Cu, Fe, and Mn.