Malaysian Applied Biology Journal

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37-2-08

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Malays. Appl. Biol. (2008) 37(2):47–52

YIELD AND AGRONOMIC CHARACTERISTICS OF TROPICAL RICE AS INFLUENCED BY HIGH NITROGEN RATES

NORI, H.1*, HALIM, R.A.2 and RAMLAN, M.F.2

1Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia.
2 Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia.
*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

ABSTRACT

An experiment with treatments comprising of five nitrogen rates (0, 120, 160, 200 and 240 kg N/ha) applied as urea was carried out to evaluate the effects of high nitrogen application on the yield and agronomic performance of two rice varieties; MR 211 and MR 219. Raising nitrogen application was found to increase (P<0.05) the number of spikelets per panicle but reduce the percentage of filled spikelets (P<0.05). Although the increment in number of spikelets per panicle resulted in the reduction of the filled spikelets percentage, the grain yield was not affected due to sufficient production of spikelets per square meter which maintained the grain productivity. The plant agronomic characteristics such as stem height and duration to grain maturity also increased (P<0.05) with nitrogen application. Both varieties differ in the yield components and agronomic characteristics. Between the two varieties, MR 219 is superior to MR 211 in view of the higher grain yield and grain: straw ratio. The result from correlation between yield and yield components implies that the total number of spikelets per square meter was believed to be the major determinant of grain yield.


ABSTRAK

Eksperimen menggunakan lima kadar nitrogen (0, 120, 160, 200 dan 240 kg N/ha) daripada baja urea telah dijalankan untuk mengkaji kesan input nitrogen yang tinggi pada hasil dan prestasi agronomi dua varieti padi; MR 211 dan MR 219. Peningkatan kadar nitrogen didapati telah meningkatkan (P<0.05) bilangan biji setangkai tetapi mengurangkan peratusan biji bernas (P<0.05). Walaupun peningkatan dalam bilangan biji setangkai memberikan kesan kepada pengurangan dalam peratusan biji bernas, namun keadaan ini tidak mempengaruhi hasil padi. Ini kerana terdapat jumlah biji semeter persegi yang mencukupi untuk mengekalkan produktiviti padi tersebut. Ciri agronomi padi seperti ketinggian batang dan tempoh matang juga didapati meningkat (P<0.05) dengan penggunaan baja nitrogen. Kedua-dua varieti didapati berbeza dari segi komponen hasil dan ciri agronomi. Dalam perbandingan di antara kedua-dua varieti, MR 219 adalah lebih baik berbanding MR 211 kerana mempunyai hasil padi dan nisbah padi: jerami yang lebih tinggi. Keputusan daripada ujian korelasi di antara hasil padi dan komponen-komponen hasil menerangkan bahawa jumlah biji semeter persegi merupakan faktor utama yang menentukan prestasi hasil padi.

Key words: Nitrogen, rice, variety, yield components

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