scholarly journals Characteristics of dry matter production process in high yielding rice varieties. I. Canopy structure and light intercepting characteristics.

1990 ◽  
Vol 59 (1) ◽  
pp. 130-139 ◽  
Author(s):  
Kuniyuki SAITOH ◽  
Hiroyuki SHIMODA ◽  
Kuni ISHIHARA
1992 ◽  
Vol 61 (1) ◽  
pp. 62-73 ◽  
Author(s):  
Kuniyuki SAITO ◽  
Hiroyuki SHIMODA ◽  
Kuni ISHIHARA

1972 ◽  
Vol 23 (6) ◽  
pp. 945 ◽  
Author(s):  
JF Angus ◽  
R Jones ◽  
JH Wilson

Under conditions of adequate moisture an erect-leaf barley cultivar, Lenta, responded to an increase in density (resulting from doubling of the sowing rate) with increases in dry matter production and in grain yield, whereas the cultivar Research, which has long lax leaves, responded with decreases in dry matter production and yield. In a study of canopy structure and its effects on light interception and utilization, it was found that in Research, with a leaf area index (LAI) of 6.1, the leaves were concentrated near the canopy surface and a relatively small proportion of the above-crop light penetrated through this layer. The net crop photosynthesis of this canopy (measured in a field assimilation chamber) was 3.8 g CO2/m2.hr when visible radiation was 313 W/m2. With Lenta (LAI 7.0) on the other hand, leaves were concentrated in the middle layers of the canopy and the light was more evenly distributed throughout the canopy. The net crop photosynthesis with the same radiation as for Research was 4.3 g CO2/m2.hr. The relative rates of photosynthesis at various levels in the canopies were determined by introducing 14CO2 into the assimilation chambers enclosing the cultivars and observing where the 14C was fixed. With Research most of it was localized near the canopy surface while with Lenta most of it was near the centre of the canopy. Of the 14CO2 taken up, 7 % was fixed in the leaf sheaths of Research and 12% in those of Lenta.


1991 ◽  
Vol 60 (2) ◽  
pp. 255-263 ◽  
Author(s):  
Kuniyuki SAITO ◽  
Sinya KASIWAGI ◽  
Takahiro KINOSITA ◽  
Kuni ISHIHARA

2002 ◽  
Vol 71 (4) ◽  
pp. 481-487 ◽  
Author(s):  
Tadashi TAKAHASHI ◽  
Kanae SHIMAUCHI ◽  
Yuko NAKAGAWA ◽  
Kaori SHIBATA ◽  
Takeshi IIYAMA

1977 ◽  
Vol 46 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Akihito KUSUTANI ◽  
Kimio NAKASEKO ◽  
Kanji GOTOH

2016 ◽  
Vol 14 (1) ◽  
pp. 37-45
Author(s):  
R Yasmeen ◽  
S Akter ◽  
T Halder ◽  
A Biswas ◽  
MM Rahman ◽  
...  

The experiment was conducted to study the performance of three T. Aman varieties (BR22, BRRI dhan46 and BRRI dhan49) under normal transplanting with 30, 45 and 60 days old seedlings and double transplanting ( 30 days + 30 days) system at Plant Physiology Division of Bangladesh Rice Research Institute, Joydebpur, Gazipur during T. Aman season, 2013. Interaction effect was significant only for days to maximum flowering and sterility percentage. BR22 required longer duration to complete flowering when transplanted with 60 days old seedlings, while sterility percentage was higher in BRRIdhan 49 when transplanted with same aged seedlings. Photosynthetic rate, LAI, total dry matter production, yield contributing characters and harvest index of tested varieties were insignificant under different transplanting methods; these parameters contributed to produce similar grain yield. The results revealed that rice varieties BR22, BRRI dhan46 and BRRI dhan49 showed similar performance under normal transplanting with different aged seedlings and double transplanting in respect of photosynthetic rate, tillering pattern, LAI, total dry matter production and grain yield during T. Aman season.SAARC J. Agri., 14(1): 37-45 (2016)


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