Relatively Simple Irrigation Scheduling and N Application Enhances the Productivity of Aerobic Rice (Oryza sativa L.)

2007 ◽  
Vol 2 (4) ◽  
pp. 261-268 ◽  
Author(s):  
J. Maheswari ◽  
N. Maragatham ◽  
G. James Martin
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Irrigation Scheduling ◽  
Aerobic Rice ◽  
N Application

Effect of varieties and weeding regimes on weed and performance of

2011 ◽  
Vol 1 (3) ◽  
pp. 121-130
Author(s):  
U. Ismaila ◽  
M. G. Kolo ◽  
A. U. Gbanguba
Keyword(s):  
Oryza Sativa ◽  
Active Ingredient ◽  
Oryza Sativa L ◽  
Weed Suppression ◽  
Dichlorophenoxyacetic Acid ◽  
Aerobic Rice ◽  
Split Plot ◽  
Main Plot ◽  
And Performance ◽  
Plot Design

A Field trial was conducted at the aerobic rice experimental field of the NationalCereals Research Institute (NCRI), Badeggi, Nigeria (9 ° 04 N and 6° 7 E)in 2007 and 2008 wet seasons to determine the weed competitiveness andperformance of inter Ã¢â‚¬Â and intra‐specific aerobic rice (Oryza sativa L.) varietiesunder seven weeding regimes. The trial was laid out in a split plot designwith the two varieties of rice (NERICA 1 as inter Ã¢â‚¬Âspecific and FARO 46 asintra Ã¢â‚¬Âspecific) assigned to the main plot while seven weeding regimes (hoeweeding at 25, 45, and 65 days after sowing (DAS), 25 DAS, 45 DAS, 25 and45 DAS, application of 3’,3’ Ã¢â‚¬Â dichloropropionanilide /2, 4 – Dichlorophenoxyacetic acid (orizo plus R) by Candel Company Ltd. at 3.5 kg active ingredient(ai )ha Ã¢â‚¬Â1 at 25 DAS, hoe weeding at 25 DAS followed by orizo plus at 3.5 kg aiat 45 DAS and weedy check) constituted the sub – plots. The treatmentswere replicated three times in a split plot design. From the results, interspecificvariety (NERICA1) had better weed suppression ability with highergrain yield of 3.1 t ha Ã¢â‚¬Â1 than the intra‐specific variety (FARO 46). Weed controlwas better when hoe weeding was done at 25, 45 and 65 DAS or 25 and45 DAS and at 25 DAS followed by orizo plus at 45 DAS than in other treatments.However, hoe weeding at 25, 45 and 65 DAS gave significantlygreater grain yield than other treatments. Although economic yield was obtainedfrom hoe weeding at 25 DAS followed by orizo plus at 45 DAS.

scholarly journals Growth response of two Nerica rice (Oryza sativa L.) varieties on irrigation scheduling in Mwea irrigation scheme, Kenya

2019 ◽  
Vol 6 (2) ◽  
pp. 183-191
Author(s):  
Etabo Edung Mathew ◽  
◽  
N. K. Korir ◽  
Gweyi-Onyango J. P. ◽  
T. E. Akuja ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Growth Response ◽  
Oryza Sativa L ◽  
Irrigation Scheduling ◽  
Irrigation Scheme

scholarly journals Effect of nitrogen scheduling in early and late planted medium duration rice (Oryza sativa L.)

2021 ◽  
Vol 23 (3) ◽  
pp. 279-285
Author(s):  
Keyword(s):  
Oryza Sativa ◽  
Growth Parameters ◽  
Oryza Sativa L ◽  
Growth Yield ◽  
Research Station ◽  
Dry Matter Accumulation ◽  
N Application ◽  
Yield Attributes ◽  
Late Planting ◽  
Four Levels

A field experiment on rice (Oryza sativa L.) crop was conducted at Rice Research Station, Kaul (Kaithal), India during kharif season of 2017 and 2018 to evaluate the optimum schedule of nitrogen application in the rice grown under early and late planting conditions. The treatments consisted of three timings of transplanting (3rd week of June, 1st week of July and 3 rd week of July), four levels of N (90, 120, 150 and 180 kg Nha-1) and four timings of N fertilizer application (½ at transplanting + ½ at 21 DAT, ½ at 21 DAT + ½ at 42 DAT, 1/3 at transplanting + 1/3 at 21 DAT + 1/3 at 42 DAT and LCC based N supply) and were laid out in split-plot design with transplanting time and N levels in main plots and N application time in sub-plots. The growth parameters (plant height, number of tillers/m2 and dry matter accumulation/m2), yield attributing characters (number of panicles/m2 and grains/panicle) and yield (grain and straw yield) of rice crop reduced significantly under late planting (3rd week of July) as compared to that under the two earlier plantings (3rd week of June and 1stweek of July) whereas the two earlier plantings were at par in respect of these parameters. The growth, yield attributes and the yield increased with every increase in N application rates but the increase was significant up to 150 kg Nha-1. The highest yield was (7.33 tha-1), however, obtained with the crop transplanted early (up to1st week of July) and supplied with 150 kg Nha-1.Application of N in three equal splits (at 0, 21 and 42 DAT or as per LCC schedule), being at par, resulted into higher yield (grain and straw) than the N application in two equal splits. The net returns and B: C ratio increased appreciably with increase in N application levels upto 150 kg Nha-1 obviously due to increase in crop yield.

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