Studies on the Growth Control and the Nutritional Diagnosis in Rice Plants : I. The nutritional diagnosis based on the leaf color and the estimation of the number of spikelets per unit area

Matsuzaki, Akio; Kariya, Kunio; Machida, Hiroyasu; Tsunoda, Kosei

doi:10.1626/jcs.49.439

Cited by 11 publications

(4 citation statements)

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“…These might have been caused by the depletion of nutrients (N) by weeds in the weedy check, and a subsequent reduction in leaf chlorophyll content. The chlorophyll meter quantifies the green colour of the plant immediately (Yadava 1986) and can potentially provide an estimate of the N status of rice crops (Matsuzaki et al. 1980, Inada 1985).…”

Section: Resultsmentioning

confidence: 99%

Chlorophyll Dynamics in Rice (Oryza sativa) Before and After Flowering Based on SPAD (Chlorophyll) Meter Monitoring and its Relation with Grain Yield

Ramesh

Chandrasekaran

Balasubramanian

et al. 2002

J Agronomy Crop Science

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The rice plant at any point in time is composed of leaves of physiologically dierent ages, so it follows that the leaves dier in their contributions to the growth of the whole plant and its grain yield. As the leaf chlorophyll content (Soil Plant Analytical Division value) is the best indicator of photosynthetic activity in rice, the chlorophyll content of rice before and after¯owering was determined in a weed management ®eld experiment on direct wet seeded rice. The results indicated that the leaf chlorophyll content at 79 days after sowing correlated well with the grain yield of rice. Multiple regression models also indicated the dependence of rice yield on leaf chlorophyll content before and after¯owering.

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Section: Resultsmentioning

confidence: 99%

Chlorophyll Dynamics in Rice (Oryza sativa) Before and After Flowering Based on SPAD (Chlorophyll) Meter Monitoring and its Relation with Grain Yield

Ramesh

Chandrasekaran

Balasubramanian

et al. 2002

J Agronomy Crop Science

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“…The recovery effi ciency (RE) is below 30% when ammonium sulfate or urea is applied at transplanting. Numerous studies have shown that the RE of N can be improved by split application and it is most effi cient when N-dose distribution is designed to match N demand by the growing crop, typically monitored with leaf color charts (Matsuzaki et al, 1980) or the chlorophyll meter (SPAD) (Peng et al, 1996). Refl ecting such a concept of N application, the extension authority in Shiga, Japan changed the recommendation of N fertilization in early 1980s from 70% basal and early dressings to one with decreased early dressings (30%) and increased later dressings (70%) and a reduced total amount.…”

Section: Improved Nitrogen Management : As Shown Inmentioning

confidence: 99%

“…Among them, N management based on crop diagnosis as indicated by Peng et al, (1996) may be most appropriate. Instead of a costly chlorophyll meter, leaf color charts (Matsuzaki et al, 1980) are available with modest cost. Diagnosis with use of this chart and careful fi eld observation of rice growth and development will enable rice yield increase through effi cient use of fertilizer.…”

Section: Production Technologies Toward Increased Yield In Irrigated mentioning

confidence: 99%

Can Yields of Lowland Rice Resume the Increases that They Showed in the 1980s?

Horie¹,

Shiraiwa²,

Homma³

et al. 2005

Plant Production Science

169

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“…Other Japanese plant scientists have been developing a quick, non-destructive method for monitoring changes in leaf chlorophyll which may be adapted to assess the nutrient status offruit trees and field crops (Kariya et al, ll982;Inada, 1985). The chlorophyll meter quantifies 1~een color in plants by immediately and nondestructively measuring chlorophyll status (Yadava, 1986) and has the potential to provide insight into the N status of rice crops (Matsuzaki et al, 1980;Inada, 1985). This 3-yr study evaluated the use of a hand-held chlorophyll meter for determining the relationship between leaf chlorophyll and the need for topdress N in semidwarf rice at four plant growth stages.…”

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confidence: 99%

Chlorophyll Meter to Predict Nitrogen Topdress Requirement for Semidwarf Rice

1991

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Semidwarf rice (Oryza sativa L.) tolerates excessive N fertilizer without lodging. In fact, it is difficult to maximize semidwarf rice yield without applying excessive N fertilizer since most farmers have not found a quick, unbiased, reliable method for assessing the N requirement for rice plants. A portable chlorophyll meter that instantly provides a measure of leaf chlorophyll may quickly monitor the need for additional N fertilizer. The Minolta model SPAD 502 chlorophyll meter was evaluated during a 3‐yr period for its potential to determine the need for N fertilizer by semidwarf ‘Lemont’ rice grown in research plots on several soils and locations in Texas. Preplant N rates ranging from 56 to 280 kg N ha−1 were applied to paired plots to develop plots with a range in leaf chlorophyll. At one of four plant growth stages, one of the pair of plots was topdressed with 50 kg N ha−1 after measuring leaf chlorophyll. At the prepanicle initiation and panicle differentiation stages, the rice yield increase due to N topdressing dropped from about 1600 to 100 kg ha−1 as the chlorophyll meter readings of the most recently matured leaf increased from 24 to 42, respectively. As chlorophyll readings exceeded 40, N fertilizer did not increase yield. However, at the tillering and heading growth stages chlorophyll readings were not well correlated with N fertilizer needs. These data provide evidence that the chlorophyll meter can be used to determine topdress N needs of semidwarf rice at pre‐panicle initiation and panicle differentiation.

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Studies on the Growth Control and the Nutritional Diagnosis in Rice Plants : I. The nutritional diagnosis based on the leaf color and the estimation of the number of spikelets per unit area

Cited by 11 publications

References 0 publications

Chlorophyll Dynamics in Rice (Oryza sativa) Before and After Flowering Based on SPAD (Chlorophyll) Meter Monitoring and its Relation with Grain Yield

Chlorophyll Dynamics in Rice (Oryza sativa) Before and After Flowering Based on SPAD (Chlorophyll) Meter Monitoring and its Relation with Grain Yield

Can Yields of Lowland Rice Resume the Increases that They Showed in the 1980s?

Chlorophyll Meter to Predict Nitrogen Topdress Requirement for Semidwarf Rice

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