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Influence of seed moisture content on seed quality of Bambara groundnut (Vigna subterranean L. Verdc)
(2024-03-01)
Wongwichaiwat, S.
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Chotechung, S.
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Kinnaret, P.
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Kaewtaphan, P.
;
Anothai, J.
Two varieties of bambara groundnut (Vigna subterranean L. Verdc) were evaluated for seed quality under different seed moisture contents between 8, 10 and 12%, and the seeds were stored under ambient condition for six months. Songkhla 1 maintained high germination percentage (91.11%) and high germination index (24.43) after storage for six months, whereas TVsu 1221 showed low germination percentage (54.67%) and germination index (14.83) in two months after storage. Differences among seed moisture contents were low and seed moisture content of 12% was better than seed moisture content of 8% for germination percentage and germination index. Variations between bambara groundnut varieties and seed moisture contents were low for shoot length and seedling dry weight. These parameters seemed to be not suitable for evaluation of seed quality of bambara groundnut.
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Possibility to use crop models for indirect prediction of glycemic index in rice
(2024-01-01)
Phopaijit, S.
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Somchit, P.
;
Phakamas, N.
A process for constructing the prediction equations was developed by using simulated biomass and simulated grain yield to be estimating the glycemic index (GI) of two rice varieties, and reference GI was used as a basis for calculation of predicted GI. The CSM-CERES-Rice model was able to construct the best prediction equations, and the equation developed by using simulated biomass and simulated yield were y = 0.0003x + 59.099 and y = 0.0008x + 59.213, respectively. The equations were also used for prediction of GI values of two rice varieties applied with different methods of nitrogen application. The difference of the equations was 0.0% for both simulated biomass and simulated grain yield. The process for indirect prediction of GI is used available simulated data of biomass and grain yield to improve prediction accuracy.
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Influence of calcium from different seashells on growth and yield of Khon Kaen 6 peanut cultivar
(2023-11-01)
Hongyotee, T.
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Somchit, P.
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Phakamas, N.
Application of all calcium sources increased biomass and crop growth rate of peanut. Significantly increasing in biomass was found in the crop threated with gypsum. The crop growth rate was significantly increased in the crop treated with gypsum, mussel and clams. Application of calcium sources was not significantly affected on yield and yield components of peanut. The possibility to used seashells as an alternative calcium source for peanut production.
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Rate of Azolla microphylla dry matter on nitrogen use efficiency and yield of Japonica rice
(2023-11-01)
Suraphonphinit, A.
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Phakamas, N.
;
Samart, S.
The responses to the application of Azolla microphylla dry matter for nitrogen use efficiency for biomass (NUE) and nitrogen use efficiency for grain yield (NUEg) were investigated in two Japonica rice varieties. NUE and NUEg reduced with higher rated of Azolla application. The highest values were recorded at the rate of 37.5 kg N ha-1, and the lowest values were recorded at 187.5 kg N ha-1. DOA1 was higher than DOA2 for NUE, but they were similar for NUEg. Grain yields increased with higher rates of Azolla application. Grain yield was the lowest at the rate of 37.5 kg N ha-1 and the highest at the rate of 187.5 kg N ha-1. DOA1 and DOA2 which were similar for grain yield.
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Growth and yield performance of Bambara groundnut advanced line and introduced accessions grown in the rainy season in the South of Thailand
(2023-05-01)
Wongwichaiwat, S.
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Chotechung, S.
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Anothai, J.
;
Phakamas, N.
Result showed that the days to 50% flowering among four bambara groundnut genotypes ranged from 31.75 days to 34.25 days and days to harvest ranged from 93 days to 125 days. TVsu 89 had the lowest days to 50% flowering of 31.75 days and days to harvest of 93 days. TVsu 89 had lower agronomic traits than check variety (Songkhla 1), but it was not different from check variety for fresh pod yield and dry pod yield. Correlation analysis indicated that harvest index was positively and significantly associated with fresh pod yield and dry pod yield.
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Effects of urea and sunn hemp on nitrogen use efficiency and physiological traits related to Japonica rice yield
(2023-05-01)
Khemtong, J.
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Phakamas, N.
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Somchit, P.
Application of sunn hemp as a sole fertilizer could provide nitrogen use efficiency (NUE), tiller number, leaf area index (LAI), crop growth rate (CGR), biomass and grain yield higher than application of urea as a sole fertilizer. Correlation coefficients (r) among some physiological traits including LAI, CGR, NUE, NUE for grain yield (NUEg) and agronomic traits consisting of tiller number, biomass and grain yield were significantly positive resulted which ranged between 0.65 and 1.00. The results indicated that application of sunn hemp as green manure can promote growth and yield of Japonica rice and tend to be a good choice for supplying nitrogen in Japonica rice production.
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Effects of calcium sources on physiological traits related to pod and seed yield of peanut
(2022-01-01)
Inban, N.
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Somchit, P.
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Phakamas, N.
Gypsum is an important calcium source in peanut production system as calcium is required for pod and seed filling to attain acceptable pod yield. Other sources of calcium may be used as gypsum substitutes in case they are available at low cost or free available. Calcium sources were significantly different for crop growth rate (CGR), pod growth rate (PGR), total dry matter at 65 and 92 DAP, and seed yield at harvest. Crop growth rate during planting to 65 DAP was significantly related to pod yield with R2=0.56∗∗. Pod growth rates during 65 to 92 DAP and 92 to 125 DAP were significantly related to pod yield with R2= 0.35∗∗and 0.54∗∗, and also related to seed yield with R2= 0.29∗and 0.57∗∗, respectively.
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Effects of chicken manure and chemical fertilizer on Growth and Yield of Japonica Rice
(2022-01-01)
Phopaijit, S.
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Suraphonphinit, A.
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Phakamas, N.
Organic and inorganic nitrogen fertilizers are normally used in Indica rice (Oryza sativa L.) production system, but information on the effects of chicken manure on Japonica rice is limited. The effects of chicken manure and chemical fertilizers on growth and yield of Japonica rice were determined. Rice varieties were significantly different for most traits including plant height, crop growth rate (CGR), biomass, percentage of filled and unfilled grain, number of grains per spikelet and harvest index (HI), except for grain yield. Chemical fertilizer had the highest grain yield followed by chicken manure, non-treated control and chemical fertilizer together with chicken manure, respectively. The interaction effects between fertilizer treatment and rice variety were not significant for all characters. These rice varieties seemed to better respond to chemical fertilizer than chicken manure treatments.
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Effects of different forms nitrogen fertilizer on growth and yield of four tropical pasture grasses
(2018-12-01)
Buamool, P.
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Phakamas, N.
Nitrogen fertilizer is an essential plant nutrient of tropical pasture crops. The effect of nitrogen fertilizer in forms of urea and ammonium sulphate on growth and yield of four tropical pasture grasses was determined. The results showed that four tropical pasture grasses were significantly different for tiller number, SCMR, CGR during the regrowth, fresh weight yield and dry matter yield, when different forms of nitrogen fertilizer were applied. Application of urea resulted in higher fresh yield (9.6-10.7 t/ha/time) and dry matter yield (1.3-2.0 t/ha/time) than did application of ammonium sulphate and control. Application of urea also had higher tiller number and higher crop growth rate during the regrowth period after each cutting time than application of ammonium sulphate and unfertilized control. Application of urea at the rate of 62.5 kg N/ha is recommended for growing Purple Guinea, Mombasa Guinea, Ruzi and Mulato II in Thailand. The interaction between pasture grass and nitrogen form was not significant in this study.
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Application of soil test kit for evaluating nitrogen fertilizer requirement of Napier Pakchong 1 grass in Thailand
(2018-12-01)
Phakamas, N.
;
Yampracha, S.
A soil test kit may be applicable for nitrogen management in pasture grass production. The nitrogen fertilizer requirement of Napier Pakchong 1 grass (Pennisetum purpurem ×Pennisetum amenicanum cv. Pakchong 1) was evaluated by using a soil test kit (STK). Result showed that the application of nitrogen fertilizer in the forms of urea and ammonium sulphate increased in dry mater yield of Napier Pakchong 1 grass, whereas application of cattle manure at both recommended rates and the recommended rate by STK gave the dry matter yield similar to the unfertilized control. Application of ammonium sulphate gave better than application of urea. The clay soil with moderate soil fertility and high soil moisture content, the soil test kit provided the acceptable guideline for nitrogen management in Napier Pakchong 1 grass. The application of the soil test kit for nitrogen fertilizer management of Napier Pakchong 1 grass in other soil types are noted.

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