Milling Yield of Rough Rice Blended at Different Moisture Contents

Calderwood, D. L.

doi:10.13031/2013.32769

Cited by 7 publications

(5 citation statements)

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“…The results of the mixing treatments are more extreme than those of Calderwood (1984). Calderwood showed that mixing high moisture content rice at 22 % with low moisture content rice at 12, 10 and 8% in 1:1 ratios produced no head rice yield reductions in the 12 % case and 4 and 6.5 percentage point reductions for the 10 and 8% cases, respectively.…”

Section: Resultsmentioning

confidence: 92%

“…Another method by which the effects of moisture adsorption have been studied is by direct mixing of high and low moisture content rice. Calderwood (1984) mixed high moisture rough rice varying from 17 to 22% MC with low moisture rice varying from 7 to 12 % MC in various proportions. The results indicated that severe reductions in head rice yields did not occur until rice at 8% MC or lower was mixed with rice at 17% MC or higher.…”

Section: Review Of Literaturementioning

confidence: 99%

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Effects of Moisture Adsorption on the Head Rice Yields of Long-Grain Rough Rice

Siebenmorgen¹,

Jindal²

1986

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T HE head rice (whole kernel) yield oflong-grain rough rice ranging from 7.6 to 19.2% initial moisture content was determined after subjecting the rice to moisture adsorption conditions. The conditions ranged from those representing severe moisture adsorption environments-soaking in water, misting with water. equilibrating to a 95% relative humidity environment-to less severe methods created by mixing low and high moisture contcnt rice in proportions of 3: 1. I :1. and I :3. All methods showed significant reduction in head rice yield whcn the moisture content at which remoistening was initiated was lower than 13%,. Remoistening of rice at a moisture content above 16°)(, had no discernable effect on head rice yields. Head rice yields lower than 2% were prodnced by severe moisture adsorption treatments when rice at 7.6%, moisture content was remoistened. The effects of the moisturc adsorption treatments on head rice yields were accurately described by a two-parameter. sigmoid equation commonly 1I sed to prcsent adsorption and desorption isotherms in cereal grains.

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Section: Resultsmentioning

confidence: 92%

Section: Review Of Literaturementioning

confidence: 99%

Effects of Moisture Adsorption on the Head Rice Yields of Long-Grain Rough Rice

Siebenmorgen¹,

Jindal²

1986

Transactions of the ASAE

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“…Moisture adsorption-induced fissuring is generally associated with water entering a relatively dry kernel. Such moisture adsorption environments are created 1) by rainfall or high-humidity conditions, as well as diurnal cycles of temperature and relative humidity (RH) in fields before harvest, 2) in bins holding freshly harvested rice, 3) in certain types of dryers ahead of the drying front, and 4) in postharvest operations as a result of inadvertent overdrying and subsequent rewetting of rice (Kunze and Prasad 1978;Calderwood 1984;Siebenmorgen and Jindal 1986). Hence, these fissures usually appear as "large internal fractures perpendicular to the long axis of the kernel" (Sharma and Kunze 1982).…”

mentioning

confidence: 99%

Physical and Functional Characteristics of Broken Rice Kernels Caused by Moisture‐Adsorption Fissuring

Mukhopadhyay

Siebenmorgen

2017

Cereal Chem

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Cereal Chem. 94(3):539-545Fissuring caused by rapid moisture adsorption generates broken kernels upon milling; brokens are often ground to flour. The recent increase in demand for rice flour has promoted interest in brokens. This study investigated the physical and functional characteristics of brokens resulting from milling lots with various levels of moisture adsorptioninduced fissuring. Two long-grain (LG) cultivars and one medium-grain (MG) cultivar were conditioned to five initial moisture contents (IMCs), rewetted, and then reconditioned to 12% moisture content. Brown rice fissure enumeration and milling analyses as well as size distribution and functionality analyses of brokens were conducted. As IMC decreased, the percentage of fissured kernels increased and, consequently, the amount of brokens generated increased. Although the number of fissures/kernel also increased with decreasing IMC, the mass distribution of the resultant brokens was not affected by IMC. Across all IMC levels, the mass percentage of the medium-sized brokens was greatest for the LG cultivars, whereas that of the large-sized brokens was greatest for the MG cultivar. Regardless of IMC, peak, setback, and final viscosities were greatest for head rice and decreased significantly with decreasing size of brokens. Thus, brokens of different sizes have different functional properties and, hence, may be fractionated for different end-use applications. † Corresponding

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“…On the other hand, it was observed that field 9 underwent rewetting of grains before harvesting due to rains, so that the moisture content of the grains increased to 27.4% at the time of harvest which might have reduced the head rice yield to 38.72% as well (Figure 1). Several researchers have observed that rewetting or adsorption of moisture, by paddy kernels will reduce the head rice yield if the paddy has dried below certain variety specific moisture content (Seibenmorgen and Jindal, 1986;Calderwood, 1984).…”

Section: Effect Of Tip Velocity On Head Rice Yieldmentioning

confidence: 99%

Milling recovery and quality of combine harvested paddy: a case study in Batticaloa and Ampara Districts

et al. 2015

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Grain quality directly affects the profitability of a crop. This study investigated the field operational conditions of combine harvesters with respect to the quality of the grain. A total of six brands of combine harvesters were tested in 10 different fields in Batticaloa and Ampara districts. The damages imposed on grains were determined based on the milling quality of the samples. The holistic view of data from farmers' field trials indicated that the combine forward speed, tip velocity of threshing drums and grain moisture content highly influenced the physical damages caused to the paddy grains during milling. Threshing unit tip velocity of the combine harvesters were found to be in the range of 10.35-39.51 m/s. The tip velocity of 10.35 m/s gave the lowest broken percentage of 15.38% and a higher head rice yield of 49.45%. Relatively low percentages of broken rice of 19.32% and 27.45% were obtained at high forward speeds of 1.36 and 2.5 m/s, respectively. This could be due to the creation of cushioning effect on the grains by increasing feed rate. High impacting forces on the grains at increased tip velocities caused the grain fissures which decreased the quality of seed paddy. The lowest grain moisture content of 15.9% yielded a relatively high broken rice percentage of 33.98 kg/ha at the tip velocity of 24.64 m/s. The highest grain damage of 39.94 kg/ha was obtained during milling at the tip velocity of 39.51 m/s at the moisture content of 20.9%.

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Milling Yield of Rough Rice Blended at Different Moisture Contents

Cited by 7 publications

References 0 publications

Effects of Moisture Adsorption on the Head Rice Yields of Long-Grain Rough Rice

Effects of Moisture Adsorption on the Head Rice Yields of Long-Grain Rough Rice

Physical and Functional Characteristics of Broken Rice Kernels Caused by Moisture‐Adsorption Fissuring

Milling recovery and quality of combine harvested paddy: a case study in Batticaloa and Ampara Districts

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