Some Factors Influencing the Artificial Drying of Mature Grain Corn

McRostie, G.P.

doi:10.2134/agronj1949.00021962004100090006x

Cited by 13 publications

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“…It is believed, however, that the growth chamber test allows more precise evaluations of, and more reliable quantitative comparisons between the growth performances of seedlings than other available methods. Many of the previous drying studies (7, 9, 11, II4., 15» 18, 20, 22, 23, 26, 29) have been primarily concerned with determining maximum safe drying temperatures for seed com® In only a few oases (lij.» 18 920,26,31) were the rates of drying given, and in these it was concluded that the rapid drying rate which they used was not injurious to the seeds § the drying rates reported, however, were comparable to theair drying rates used in the present investigation. In the experiments of the present study, seed corn harvested with more than 30 per cent moisture and dried rapidly in vacuum to less than 20 per cent in 3 to lij.…”

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confidence: 52%

Drying and germinability of maize

Struve

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supporting

confidence: 52%

Drying and germinability of maize

Struve

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“…It is well known that drying conditions, such as temperature, initial seed moisture content, and genotypes, affect the germination of maize seeds and seedling vigor. In general, increasing moisture content of harvested ears and using high temperatures during the drying process reduce seed viability and seedling vigor (Kiesselbach, 1939; McRostie, 1949; Seyedin et al, 1984; Knittle and Burris, 1976; Herter and Burris, 1989a, b, c; Cordova‐Tellez and Burris, 2002a, b). While the different desiccation tolerances among genotypes are well documented (Kiesselbach, 1939; Navratil and Burris, 1984; Chen and Burris, 1990), it is not clearly understood which mechanisms affect seed quality.…”

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“…Identifying the hybrid drying temperature tolerances has important implications in germplasm selection as well as in the industry drying management. High temperature tolerant genotypes could be dried at higher temperatures than standard protocols, reducing the time involved in the process and increasing its effi ciency, because a higher drying temperature means higher air holding moisture capacity (McRostie, 1949). Studies attempting to screen the hybrid drying tolerance are limited to few genotypes.…”

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Screening Method and Response Surface Design for Drying Hybrid Maize to Maintain Seed Quality

Arisnabarreta¹,

Eslava²,

Cannon

2012

Crop Science

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Hybrid maize (Zea mays L.) ear drying is an expensive process and considered a bottleneck in seed production. The seed industry does not have an effective procedure to screen germplasm for drying temperature sensitivity and optimum drying conditions. The aims of this paper were (i) to develop a simple, rapid, and reliable technique to screen drying temperature tolerances and (ii) to exploit the response surface design (i.e., predictive model of the relationship between factors and the response) to identify optimum drying temperatures. Trials consisted of screening experiments, in which ears were constantly dried at 35 and 45°C, and response surface experiments, in which samples were subjected to different drying temperatures in two phases (30, 35, and 40°C for the first and 35, 40, and 45°C for the second drying phase). Standard germination, cold, and accelerated aging tests were conducted to measure the effect of drying regimes on seed quality. Drying hours and rates were determined. Drying hours and rate were reduced 36 and increased 44% in the stress treatment relative to the control, respectively. Genotypes differed in drying temperature tolerances only when the cold test was used in the analyses. The response surface design allowed identifying specific temperature combinations for the first and the second drying phases that optimized quality parameters. The results of this study can be useful tool for seed industries to optimize their drying process and seed quality.

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“…It is well documented that orthodox seed types (tolerant to desiccation) acquire the ability to tolerate higher drying temperatures without detrimental effects on seed germination and vigor as maturation progresses. Maize ears harvested from 400 to 500 g H 2 O kg −1 fw could be safely dried down to 120 g H 2 O kg −1 fw with temperatures around 40°C (Kiesselbach, 1939; Washko, 1949; McRostie, 1949; Navratil and Burris, 1984), whereas ears harvested at MC < 250 g H 2 O kg −1 fw could be dried at 50°C (Navratil and Burris, 1984). Nevertheless, maize ears harvested as early as 30 d after silking and dried slowly are able to withstand desiccation (Knittle and Burris, 1976; Peterson, 1997).…”

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Embryo Drying Rates during the Acquisition of Desiccation Tolerance in Maize Seed

Córdova-Téllez

Burris²

2002

Crop Science

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germination and vigor as maturation progresses. Maize ears harvested from 400 to 500 g H 2 Okg Ϫ1 fw could be Maize (Zea mays L.) seed quality is often reduced because of safely dried down to 120 g H 2 Ok g Ϫ1 fw with temperadrying injury, although the causes and impairment mechanisms are tures around 40ЊC (Kiesselbach, 1939;Washko, 1949; poorly understood. In this study, we investigated changes in embryo McRostie, 1949;Navratil and Burris, 1984), whereas drying rates and their effect on the acquisition of desiccation tolerance in maize seed. Ears of hybrid maize [B73 ϫ (H99 ϫ H95)] were ears harvested at MC Ͻ 2 5 0gH 2 Ok g Ϫ1 fw could be harvested at about 550, 500, 400, and 320 g H 2 Ok g Ϫ1 fresh weight dried at 50ЊC (Navratil and Burris, 1984). Nevertheless, (fw) and subjected to preconditioning (PC) (ear drying at 35؇C and maize ears harvested as early as 30 d after silking and 0.47 m s Ϫ1 airflow rate) for 0, 12, 24, 36, and 48 h before fluidized dried slowly are able to withstand desiccation (Knittle bed (FB) drying (shelled seed, 35؇C and 5.10 m s Ϫ1 airflow rate)and Burris, 1976;Peterson, 1997). This may illustrate treatments to decrease moisture content (MC) to about 130 g H 2 O the importance of drying rate. kg Ϫ1 fw. Additionally, ears were entirely dried under PC (35C) and Maize seed is composed of different tissues, which unheated-air (NH) conditions. At the four harvests, different drying appear to dry at different rates because of their position. rate phases were evident in embryos of seed dried entirely at PC Under field drying conditions, embryo moisture remains (35C) conditions. A slower drying phase coincided with the PC period, about 150 g H 2 Ok g Ϫ1 fw higher than whole seed as it which increased with increasing maturation. Under FB drying, embryo MC declined at a faster rate down to about 400 g H 2 Ok g Ϫ1 fw, drops from 400 to 300 g H 2 Okg Ϫ1 fw. Then, the embryo followed by an intermediate drying rate down to about 200 g H 2 OMC decreases rapidly to equilibrium with whole seed kg Ϫ1 fw, and a slower drying rate below this point. As embryo MC at about 150 g H 2 Okg Ϫ1 fw (Struve, 1958). This phenomdeclined to 400 g H 2 Okg Ϫ1 fw at slower drying rates, either with PC enon has also been reported under artificial drying and or field drying, the ability to withstand the faster drying rates of the preconditioning (slow drying before fast drying) treat-

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Some Factors Influencing the Artificial Drying of Mature Grain Corn

Cited by 13 publications

References 0 publications

Drying and germinability of maize

Drying and germinability of maize

Screening Method and Response Surface Design for Drying Hybrid Maize to Maintain Seed Quality

Embryo Drying Rates during the Acquisition of Desiccation Tolerance in Maize Seed

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