Department of Soils, Haryana Agricultural University, Hissar-126004
A greenhouse experiment was conducted to study the N, P and K uptake in groundnut at various stages of plant growth and levels of phosphorus. Soil used for the study was non-calcareous Typio Torripsamments, low in available N, P and K. Results obtained revealed that highest concentration of N, P and K was accumulated in shoot portion at early and mid-flowering stages. About 63 and 66% of total N and P were absorbed before mid-flowering, 100% of K, however, was absorbed within 75 days of plant growth. Application of P resulted in significant increase in dry matter yield and N and P absorption in various plant parts of groundnut. N:P ratio observed was wider (11.6:1 to 7.0: 1) in shoot as compared to kernels (2.9: 1 to 3.3: 1). It decreased with P application in shoot but did not change in the kernels.
