000			02917nam a2200217 i 4500
003			CHED
005			20250131134752.0
007			ta
008			250131e2018 ph ||||| |||| 00| 0 eng d
040			_cCommission on Higher Education
100	1		_aQuevedo, Mark Joshua Sombilon
245	0	0	_aGenotypic differences in grain yield and nitrogen uptake of lowland rice (Oryza sativa L.) under two production systems and levels of nitrogen _c / Mark Joshua Sombilon Quevedo
260	3		_aLeyte _b : Visayas State University _c,2018.
300			_axix, 105 leaves _c29 x 20cm.
500			_aThesis (Master of Science in Agronomy) -- Visayas State University, December 2018
520	3		_aNitrogen fertilization and irrigation greatly contribute to improve rice yield. Excessive N application may cause harm to the environment, incur additional production cost and lower N use efficiency. With changing climate, water availability may limit rice production. This study was conducted to determine the agronomic, yield and physiological performance of inbred and hybrid rice under System of Rice Intensification (SRl) and conventional production system; to evaluate the Internal Nitrogen Use Efficiency (INUE) of these rice varieties under two production systems; and to evaluate the profitability of growing inbred and hybrid rice under these production systems. The experiment was laid out in a nested design following a randomized complete block design with two varieties as main plots (inbred and hybrid) and levels of N as subplot (0 kg N ha'and 90 kg N ha') under two production systems (SRI and conventional). Inbred rice grown under SRI headed earlier than hybrid rice in similar condition and both varieties under the conventional production system. Irrespective of production system, hybrid variety and those applied with N were taller than inbred and without N application. Regardless of variety and levels of N applied, lowland rice grown under SRI had more productive tillers, filled spikelets, heavier 1,000 grains, higher root pulling resistance (RPR) and leaf area index (LAI). Grain yield is higher when 90 kg of N is applied in any production system than without N. Inbred variety produced significantly higher grain yield similar to hybrid variety when applied with 90 kg N ha· '. Application of90 kg N ha' gave higher INUE under SRI comparable to conventional without N application. Water use in SRI was reduced by 32% than in conventional production system. Highest gross margin was attained by inbred rice applied with 90 kg N ha grown under SRI than in conventional production system.
650	1	0	_aRice _xGrain yield _zPhilippines.
856	4	0	_uhttp://181.215.242.151/cgi-bin/koha/opac-retrieve-file.pl?id=673fcc7b58131be9f1321254b25bac17 _zAbstract
856	4	0	_uhttp://181.215.242.151/cgi-bin/koha/opac-retrieve-file.pl?id=8dba5c61a5d68dcfd2a4e5d90fbb0fbe _zTable of Contents
942			_2lcc _cCHEDFR _n0
999			_c7351 _d7351