Abstract

                                A field study was conducted to quantify the effect of moisture stress onnutrient uptake and post-harvest available soil nutrient status of rice in TamilNadu Agricultural University, Coimbatore during Kuruvai (July-November)2019 and Navarai (December-March) 2019-20 seasons. Nine treatments,viz., Moisture stress at panicle initiation stage for 10 days (T1), 15 days (T2),20 days (T3) and 25 days (T4), moisture stress at flowering stage for 10 days(T5), 15 days (T6), 20 days (T7) and 25 days (T8) along with control - maintainingsaturation (T9) were tested under randomized complete block design withthree replications. Moisture stress was imposed by withdrawing water andnot irrigating in the defined period. The result showed that significantlyhigher total drymatter production and N, P and K nutrient uptake (grain,straw and total) during both the seasons were observed in T9 treatmentthan all other moisture stress imposed treatments. The least uptake of N,P and K in grain, straw and total was recorded in T4 and was statisticallyat par with T3. There was reverse trend on post-harvest soil nutrient status(NPK). The study revealed that moisture stress was more sensitive duringpanicle initiation stage than flowering stage, which directly influenced theuptake of nutrients in rice and there was a reverse trend on post-harvestsoil available nutrients (NPK).

Key words : Rice, soil moisture stress, panicle initiation stage, flowering stage, nutrient uptake, postharvest available soil nutrients