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Response of sensitive to lodging rice cultivar to nitrogen l | 17056
International Research Journals

Response of sensitive to lodging rice cultivar to nitrogen levels in heading stage and phosphorus rates at the North of Iran

Abstract

Ghorbannia E, Dastan S *, Mobasser HR and Ghanbari-Malidarreh A

This experiment was done as factorial in randomized complete block design with three replications. Nitrogen levels in heading stage chosen as (0, 50 and 100 kg ha-1 as P2O5 Urea) and phosphorus rates as (0, 75, 150 and 225 kg ha-1 as P2O5 Urea) were treatment. Results showed that stem length, fourth inter-node bending moment, total tiller number per hill, fertile tiller per hill, grain yield and straw yield had significant in nitrogen levels at 1 % and plant height and panicle length had significant in nitrogen levels at 5 % level probability. The highest grain yield (590.1 g m2) was produced for 100 kg N ha-1. Maximum straw yield was produced in 100 kg N ha-1, and minimum of that had observed for control and 50 kg N ha-1. The most plant height, flag leaf length, total tiller number and fertile tiller number were obtained for 50 and 100 kg N ha-1, but the highest forth inter-node bending moment was observed in control and 50 kg N ha-1. Plant height, stem length, flag leaf length, and fourth inter-node bending moment increased 11.54, 11.99, 13.48, 6.78 % by phosphorus application. Lowest fourth internode bending moment had observed at interaction of 100 kg N ha-1 �?�? control. The highest grain yield was produced at interaction of 100 kg N ha-1 �?�? control. Therefore, application of 100 kg N in heading stage due to highest grain yield and rice plant was the best treatment, because of deficit phosphorus in soil, showed the best response to 225 kg P ha-1. This experiment was done as factorial in randomized complete block design with three replications. Nitrogen levels in heading stage chosen as (0, 50 and 100 kg ha-1 as P2O5 Urea) and phosphorus rates as (0, 75, 150 and 225 kg ha-1 as P2O5 Urea) were treatment. Results showed that stem length, fourth inter-node bending moment, total tiller number per hill, fertile tiller per hill, grain yield and straw yield had significant in nitrogen levels at 1 % and plant height and panicle length had significant in nitrogen levels at 5 % level probability. The highest grain yield (590.1 g m2) was produced for 100 kg N ha-1. Maximum straw yield was produced in 100 kg N ha-1, and minimum of that had observed for control and 50 kg N ha-1. The most plant height, flag leaf length, total tiller number and fertile tiller number were obtained for 50 and 100 kg N ha-1, but the highest forth inter-node bending moment was observed in control and 50 kg N ha-1. Plant height, stem length, flag leaf length, and fourth inter-node bending moment increased 11.54, 11.99, 13.48, 6.78 % by phosphorus application. Lowest fourth internode bending moment had observed at interaction of 100 kg N ha-1 �?�? control. The highest grain yield was produced at interaction of 100 kg N ha-1 �?�? control. Therefore, application of 100 kg N in heading stage due to highest grain yield and rice plant was the best treatment, because of deficit phosphorus in soil, showed the best response to 225 kg P ha-1.

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