Author(s):

C Sivaranjani, L Chithra, M Baskar, R Thamizh Vendan and K Subrahmaniyan

Abstract: Field experiment was conducted to study the influence of various silicon sources viz., Calcium Silicate (CS) and Fly ash (FA) along with graded levels of nitrogen in rice (TKM 13) on Entisol. The soil of experimental field was sandy clay loam with alkaline pH and non-saline in nature. The main plot treatments includes different levels of nitrogen viz., 0%, 75%, 100% and 125% recommended dose of nitrogen. The sub plot treatments includes CS @ 200, 400 and 600 kg ha^-1 and FA @ 10, 20 and 30 t ha^-1. The experiment was conducted in split plot design and the treatments were replicated thrice. The SPAD values and chlorophyll a, b and total chlorophyll content were recorded at tillering, panicle initiation and harvest stages. Regarding Si application the highest SPAD value was noticed with FA 30 t ha^-1 (29.9) at tillering stage followed by FA 20 t ha^-1 (28.7) and CS 600 kg ha^-1 (27.4) and were found to be significant with each other. Similarly application of N levles significantly increased the SPAD values and highest was recorded in 125% N (34.3) followed by 100% N (31.7), 75% N (22.8) and 0% N (18.0) at tillering stage. The similar trend of SPAD value was followed for panicle initiation and harvest stage. The highest total chlorophyll content with regards to Si application along with nitrogen registered the highest value in 125% N + FA 30 t ha^-1 (1.97, 2.33 and 1.40 mg g^-1 at tillering, panicle initiation and harvest stage respectively). Similar trend was followed for chlorophyll a and b at all the stages. The results revealed that application of CS or FA along with nitrogen significantly increased the SPAD value and chlorophyll content of rice at all critical stages.

Pages: 2245-2249  |  1050 Views  641 Downloads

Download (654KB)