scholarly journals The Fate of Fertilizer Nitrogen Applied to the Paddy Field and its Absorption by Rice Plant : VIII. Comparative studies of the fate of basal nitrogen and the absorption of nitrogen by rice plant in different paddy fields

1976 ◽  
Vol 45 (2) ◽  
pp. 226-231 ◽  
Author(s):  
Sadao SHOJI ◽  
Teruo NOGI ◽  
Juro TAKAHASHI ◽  
Genshichi WADA
Keyword(s):  
Paddy Field ◽  
Comparative Studies ◽  
Rice Plant ◽  
Paddy Fields ◽  
Fertilizer Nitrogen

Assessment of a three-stage sampling strategy to investigate the spatial distribution and population density of Aphelenchoides besseyi among Oryza sativa seeds

Nematology ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 373-380
Author(s):  
Katsumi Togashi ◽  
Shigeru Hoshino
Keyword(s):  
Spatial Distribution ◽  
Oryza Sativa ◽  
Paddy Field ◽  
Rice Plant ◽  
Spatial Scales ◽  
Sampling Strategy ◽  
Paddy Fields ◽  
Nematode Density ◽  
Aphelenchoides Besseyi ◽  
The Mean

AbstractThis study aimed to determine the spatial distribution patterns of Aphelenchoides besseyi among Oryza sativa seeds on panicle, plant hill, and paddy field spatial scales and to present a three-stage sampling method for estimating the mean density per seed in paddy fields. Living and dead nematodes were extracted individually from 20 seeds sampled from each of five panicles, which were sampled from each of six rice plant hills in each of eight paddy fields, where all plants had leaves exhibiting the 'white tip' symptom. Nested ANOVA indicated that A. besseyi density per seed was significantly different among the eight paddy fields, among rice plant hills in paddy fields, and among panicles in rice plant hills. The proportion of nematode-infested seeds (prevalence) increased and reached an upper limit as the mean density per seed on the panicle scale increased, whereas linear relationships were observed between nematode prevalence and the mean density on plant hill and paddy field scales. Relationships between mean density and mean crowding of nematodes per seed indicated that the nematodes exhibited clumped distribution on each of panicle, plant hill and field scales. Using these relationships, a three-stage sampling plan for estimating nematode density per seed at a specified precision level is presented.

scholarly journals The Fate of Fertilizer Nitrogen Applied to the Paddy Field and Its Absorption by Rice Plant : III. Fate of top-dressed nitrogen in the soil and its absorption by rice plant

1971 ◽  
Vol 40 (3) ◽  
pp. 287-293 ◽  
Author(s):  
Genshichi WADA ◽  
Sadao SHOJI ◽  
Juro TAKAHASHI ◽  
Kimio SAITO ◽  
Itaru SHINBO
Keyword(s):  
Paddy Field ◽  
Rice Plant ◽  
Fertilizer Nitrogen

scholarly journals The Fate of Fertilizer Nitrogen Applied to the Paddy Field and Its Absorption by Rice Plant : II. The fate of basal nitrogen in the paddy field

1971 ◽  
Vol 40 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Sadao SHOJI ◽  
Genshichi WADA ◽  
Kimio SAITO ◽  
Itaru SHINBO ◽  
Juro TAKAHASHI
Keyword(s):  
Paddy Field ◽  
Rice Plant ◽  
Fertilizer Nitrogen
Sign in / Sign up

Export Citation Format

Share Document