Utilisation of azolla for rice in acidic soils
By: Habeeburrahman Pv.
Contributor(s): Sreedharan C (Guide).
Material type:
BookPublisher: Vellanikkara Department of Agronomy, College of Horticulture 1983DDC classification: 630 Online resources: Click here to access online | Click here to access online Dissertation note: MSc Abstract: An experiment was conducted at the Agricultural Reasearch Station, Mannuthy, during the first crop season of 1982 – 1983 to examine the possibility of azolla utilisation for rice in acid soils by lime application. The treatments consisted of factorial combinations of 4 levels of N (25, 50, 75 and 100% of the recommended dose of 70 kg ha-1) with four levels of lime (0,600,900 and 1200 kg ha-1) in Randomised Block Design, replicated thrice.
The investigation revealed that liming enhanced the multiplication rate of azolla.
It was also found that the vegetative characters of rice viz. height, tiller production and leaf area index showed considerable increase with N levels. Lime at 600 kg ha-1 also increased plant height and tiller number. Dry matter production also showed proportionate increase with N levels and lime application at 600 kg ha-1 have the maximum dry matter production.
Application of 75% of the recommended dose of N and 600 kg ha-1 of lime was sufficient to give higher number of panicles, number of filled grains per panicle and also 1000 grain weight.
The grain yield did not increase significantly beyond 75% of the recommended dose of fertiliser N. Lime application at the rate of 600 kg ha-1 gave maximum grain yield.
Straw yield increased significantly with nitrogen and lime.
The uptake of all the nutrients was more at higher levels of N.
The present investigation revealed the scope of dual culturing of azolla in acidic rice soils, by supplying lime at 600 kg ha-1. It also suggested a saving of 25% of the recommended dose of fertiliser N.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
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KAU Central Library, Thrissur Theses | 630 HAB/UT (Browse shelf) | Available | 171117 |
MSc
An experiment was conducted at the Agricultural Reasearch Station, Mannuthy, during the first crop season of 1982 – 1983 to examine the possibility of azolla utilisation for rice in acid soils by lime application. The treatments consisted of factorial combinations of 4 levels of N (25, 50, 75 and 100% of the recommended dose of 70 kg ha-1) with four levels of lime (0,600,900 and 1200 kg ha-1) in Randomised Block Design, replicated thrice.
The investigation revealed that liming enhanced the multiplication rate of azolla.
It was also found that the vegetative characters of rice viz. height, tiller production and leaf area index showed considerable increase with N levels. Lime at 600 kg ha-1 also increased plant height and tiller number. Dry matter production also showed proportionate increase with N levels and lime application at 600 kg ha-1 have the maximum dry matter production.
Application of 75% of the recommended dose of N and 600 kg ha-1 of lime was sufficient to give higher number of panicles, number of filled grains per panicle and also 1000 grain weight.
The grain yield did not increase significantly beyond 75% of the recommended dose of fertiliser N. Lime application at the rate of 600 kg ha-1 gave maximum grain yield.
Straw yield increased significantly with nitrogen and lime.
The uptake of all the nutrients was more at higher levels of N.
The present investigation revealed the scope of dual culturing of azolla in acidic rice soils, by supplying lime at 600 kg ha-1. It also suggested a saving of 25% of the recommended dose of fertiliser N.
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