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Nitrogen Management Options in Boro and T. Aman Rice Under Boro-fallow-t. Aman Cropping System

Amina Khatun
Senior Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur-1701

Md Asad Uz Zaman
Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur-1701

Hasina Sultana
Scientific Officer
Rice Farming Systems Division, Bangladesh Rice Research Institute, Gazipur-1701

Abstract/ Executive Summary:

To determine appropriate timing of split application of N for making accurate N fertilizer recommendations for rice, an experiment was conducted during Boro 2013-14 and T. Aman 2014 at the experimental farm of BRRI, Gazipur. There were five treatments: i) One-third of N was applied at initiation of tillering (IT) + one-third at active tillering stage (AT) + one-third at panicle initiation (PI) (N₁); ii) Half of N was applied at IT stage + another half was at PI stage (N₂); iii) One-third at IT stage + two-thirds at PI stage (N₃); iv) One-fourth at IT stage + one-fourth at AT stage + half at PI stage (N₄) and (v) N-control (N₅) were evaluated in Boro season. In T. Aman season there were six treatments: i) One third of N was applied at IT stage + one third at AT stage + one-third at PI stage (N₁); ii) One-half at IT stage + another-half at PI stage (N₂); iii) One third at IT stage + two-third at PI stage (N₃); (iv) One-fourth at IT stage + one-fourth at AT stage+ half at PI stage (N₄); v) Half at IT stage + another half at AT stage (N₅); and vi) N-control (N₆). BRRI dhan28 and BRRI dhan29 were used in Boro season and BRRI dhan49 was in T. Aman season.Nitrogen management by N application timing in Boro season indicated that highest grain yield was produced under by application of one-fourth at initiation of tillering stage (IT) + one-fourth at active tillering stage + half at PI stage in BRRI dhan29 and one-third at IT stage + two-thirds at PI stage in BRRI dahn28. In T. Aman the highest grain yield was obtained with the one-half at IT stage + another-half at PI stage treatment.

Keywords: Nitrogen management, Split application, Timing of application, Rice

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2013

End Date: 30-06-2014

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine appropriate timing of split application of N for making accurate N fertilizer recommendations for rice.

Methodology:

The experiment was conducted during Boro 2013-14 and T. Aman 2014 at the experimental farm of BRRI, Gazipur. There were five treatments: i) One-third of N was applied at initiation of tillering (IT) + one-third at active tillering stage (AT) + one-third at panicle initiation (PI) (N₁); ii) Half of N was applied at IT stage + another half was at PI stage (N₂); iii) One-third at IT stage + two-thirds at PI stage (N₃); iv) One-fourth at IT stage + one-fourth at AT stage + half at PI stage (N₄) and (v) N-control (N₅) were evaluated in Boro season. In T. Aman season there were six treatments: i) One third of N was applied at IT stage + one third at AT stage + one-third at PI stage (N₁); ii) One-half at IT stage + another-half at PI stage (N₂); iii) One third at IT stage + two-third at PI stage (N₃); (iv) One-fourth at IT stage + one-fourth at AT stage+ half at PI stage (N₄); v) Half at IT stage + another half at AT stage (N₅); and vi) N-control (N₆). BRRI dhan28 and BRRI dhan29 were used in Boro season and BRRI dhan49 was in T. Aman season. In Boro season, each treatment received 119 kg N/ha and 136 kg N/ha as urea for BRRI dhan28 and BRRI dhan29, respectively. In T. Aman season, each treatment received 70 kg N/ha as urea. Phosphorus, K, S and Zn were applied as triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively, during final land preparation as per recommended rate. The seed rate for rice was 30 kg/ha. The treatments were arranged in a randomized complete block design with three replications in both the seasons. Two/three seedlings were transplanted maintaining 20 x 20 cm spacing. In Boro season, BRRI dhan28 and BRRI dhan29 were transplanted in 2^nd week of January with 42 day-old seedlings and harvested in May. In T. Aman season, BRRI dhan49 was transplanted 2^nd week of July with 35 day-old seedlings and harvested in 1^st week of November. After transplanting the seedlings, intercultural operations like weeding, irrigation and control of pest were done as and when necessary.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2013-14

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In Boro season, significantly higher grain yield was produced under N₄, N₁, N₂ and N₃ treatments compared to N₅ treatment in BRRI dhan29. In BRRI dahn28, the highest grain yield was obtained with the N₃ treatment, followed by the N₄, N₂and N₁ treatments, and minimum under the N₅ treatment. BRRI dhan29 achieved significantly higher grain yield and straw yield compared to BRRI dhan28, irrespective of different N treatments. Nitrogen treatment had significant effect on the number of panicles and 1000-grain weight. In BRRI dhan29, the highest number of panicles was obtained with the N₄treatment followed by N₁ treatments. In BRRI dhan28, N₄ also gave the higher number of panicles followed by N₂treatment. The lowest number of panicles was observed in N₅ treatment in both the varieties. Agronomic use efficiency (AUE) was not significantly affected by N application timing. Apparently the higher AUE in BRRI dhan29 was in N₄ treatment (17.85 kg/kg) followed by N₁ and N₂ treatments (16.14 and 15.50 kg/kg, respectively). But in BRRI dhan28, the N₄treatment also gave the higher AUE (14.21 kg/kg) followed by N₃ and N₂ treatments (14.13 and 13.88 kg/kg, respectively). In T. Aman season, significantly higher grain yield was observed in N₄ treatment followed by N₃, N₂ and N₁ treatments. The lowest grain yield was produced in N₆ treatment.

Knowledge Management: Report/Proceedings