Abstract
The present study assesses the response of hybrid rice (variety Arize 6444) to potassium (K) application during rainy (wet) seasons of 2016 and 2017 in coastal saline soils of West Bengal, India. The study was conducted at the Regional Research Farm, Bidhan Chandra Krishi Viswavidyalaya, Kakdwip, West Bengal. The soil is clayeywith acidic pH (5.91), saline (Electrical conductivity/EC 1.53 dS m−1) and of high K fertility (366 kg ha−1). The experimental plots were laid out in a randomized complete block design with five (5) K treatments (0, 30, 60, 90, and 120 kg K2O ha−1) with four replications. Plant height, dry matter (DM) in different plant parts, number of tillers, and grain yield were measured in each treatment for the determination of optimum K dose. The study revealed that the stem, leaf, and grain dry matter production at 60 days after transplanting (DAT) and harvest were significantly (p ≤ 0.05) higher at 90 kg K2O ha−1 application. The number of tillers hill−1 was also higher (p ≤ 0.05) in plants fertilized with 90 kg K2O ha−1 over K omission. At harvest, grain K concentration improved (p ≤ 0.05) with K fertilization at 90 kg K2O ha−1, 116% more than the zero-K. Omission of K application from the best treatment (90 kg K2O ha−1) reduced grain yield by 3.5 t ha−1 even though the available K content was high. Potassium uptake restriction due to higher Mg content in the soil may have caused reduced uptake of K leading to yield losses. The present study also showed higher profits with 90 kg K2O ha−1 with higher net returns (US$ 452 ha−1) and benefit:cost ratio (1.75) over other treatments from hybrid rice (var. Arize 6444). From the regression equation, the economic optimum level of K (Kopt) was derived as 101.5 kg K2O ha−1 that could improve productivity of hybrid rice during the wet season in coastal saline soils of West Bengal.
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Claims 8
Claim · model-written summary
Stem, leaf and grain dry matter at 60 DAT and harvest were significantly higher at 90 kg K2O/ha in hybrid rice.
- Taxon
- hybrid rice
Oryza sativae1 - Treatment
- 90 kg K2O ha−1 applicatione0
- Outcome
- stem, leaf, and grain dry matter productione0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stem, leaf, and grain dry matter production at 60 days after transplanting (DAT) and harvest were significantly (p ≤ 0.05) higher at 90 kg K2O ha−1 application”
e1“hybrid rice (variety Arize 6444)”
Claim · model-written summary
Number of tillers per hill was higher with 90 kg K2O/ha than with K omission.
- Taxon
- hybrid riceOryza sativae1
- Treatment
- 90 kg K2O ha−1e0
- Outcome
- number of tillers hill−1e0
- Direction
- highere0
- Comparator
- K omissione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of tillers hill−1 was also higher (p ≤ 0.05) in plants fertilized with 90 kg K2O ha−1 over K omission”
e1“hybrid rice (variety Arize 6444)”
Claim · model-written summary
Grain K concentration at harvest improved with 90 kg K2O/ha, 116% more than zero K.
- Taxon
- hybrid riceOryza sativae1
- Treatment
- K fertilization at 90 kg K2O ha−1e0
- Outcome
- grain K concentratione0
- Direction
- improvede0
- Value
- 116%e0
- Comparator
- zero-Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At harvest, grain K concentration improved (p ≤ 0.05) with K fertilization at 90 kg K2O ha−1, 116% more than the zero-K”
e1“hybrid rice (variety Arize 6444)”
Claim · model-written summary
Omitting K from the best treatment (90 kg K2O/ha) reduced grain yield by 3.5 t/ha.
- Taxon
- hybrid riceOryza sativae1
- Treatment
- Omission of K applicatione0
- Outcome
- grain yielde0
- Direction
- reducede0
- Value
- 3.5 t ha−1e0
- Comparator
- the best treatment (90 kg K2O ha−1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Omission of K application from the best treatment (90 kg K2O ha−1) reduced grain yield by 3.5 t ha−1”
e1“hybrid rice (variety Arize 6444)”
Claim · model-written summary
Restricted K uptake due to higher soil Mg may have reduced K uptake and caused yield losses.
- Taxon
- hybrid riceOryza sativae1
- Compound
- Mge0
- Outcome
- yield lossese0
- Qualifier
- Potassium uptake restrictione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium uptake restriction due to higher Mg content in the soil may have caused reduced uptake of K leading to yield losses”
e1“hybrid rice (variety Arize 6444)”
Claim · model-written summary
90 kg K2O/ha gave higher net returns (US$ 452/ha) than other treatments in hybrid rice.
- Taxon
- hybrid riceOryza sativae0
- Treatment
- 90 kg K2O ha−1e0
- Outcome
- net returnse0
- Direction
- highere0
- Value
- US$ 452 ha−1e0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The present study also showed higher profits with 90 kg K2O ha−1 with higher net returns (US$ 452 ha−1) and benefit:cost ratio (1.75) over other treatments from hybrid rice (var. Arize 6444)”
Claim · model-written summary
90 kg K2O/ha gave a higher benefit:cost ratio (1.75) than other treatments in hybrid rice.
- Taxon
- hybrid riceOryza sativae0
- Treatment
- 90 kg K2O ha−1e0
- Outcome
- benefit:cost ratioe0
- Direction
- highere0
- Value
- 1.75e0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The present study also showed higher profits with 90 kg K2O ha−1 with higher net returns (US$ 452 ha−1) and benefit:cost ratio (1.75) over other treatments from hybrid rice (var. Arize 6444)”
Claim · model-written summary
The economic optimum K level derived by regression was 101.5 kg K2O/ha for hybrid rice in wet season coastal saline soils of West Bengal.
- Taxon
- hybrid riceOryza sativae0
- Outcome
- economic optimum level of K (Kopt)e0
- Value
- 101.5 kg K2O ha−1e0
- Setting
- coastal saline soils of West Bengale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the economic optimum level of K (Kopt) was derived as 101.5 kg K2O ha−1 that could improve productivity of hybrid rice during the wet season in coastal saline soils of West Bengal”
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