Influence of fertility levels on nutrient uptake and productivity of rice under puddled and unpuddled conditions

Abstract

The study was conducted during kharif season 2014 to know the effect of different fertility levels
on nutrients uptake and yield of rice under puddled and unpuddled condition. Twelve treatments
viz., Puddled rice without NPK, Unpuddled rice without NPK, Puddled rice with 100% NPK,
Unpuddled rice with 100% NPK, Puddled rice with 125% NPK, Unpuddled rice with 125% NPK,
Puddled rice with 125% N and 100% PK, Unpuddled rice with 125% N and 100% PK, Puddled
rice with 100% NK and 125% P, Unpuddled rice with 100% NK and 125% P, Puddled rice with
100% NPK Fe and Unpuddled rice with 100% NPK Fe were managed under complete randomized
block design with 3 replications. Rice variety "Pusa Basmati 1" was under taken for present study.
Uptake of all primary nutrients viz., nitrogen, phosphorus and potash had increased significantly
with application of 125% NPK under puddled condition whereas, highest zinc uptake was recorded
with 125% N and 100% PK under unpuddled condition. Application of 100% NPK Fe under
puddled condition had positive effect in iron-uptake. Yield attributes viz., panicle length, number
of grains per panicle and thousand-grain weight of rice increased significantly with the application
of 125% NPK or N over recommended NPK level and higher values of these parameter were also
recorded in puddled than unpuddled condition. Significantly higher rice grain yield of 3.6 t/ha
was recorded in the treatments consisting of 125% NPK or 125% N with 100% PK in puddled
condition. At higher fertility level 7.5% higher grain yield was recorded in puddled condition as
compared to unpuddled rice. About 6 to 12 percent increase in rice grain yield was noticed due to
puddling under different treatments.