Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

A stand for quasi-static loading measurements of seeds

100%

Sosnowski S., Czerniakowski Z.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1993

|

tom 399

241-242

This paper presents the description and application of the apparatus for quasi-static loading of leguminous seeds.

2

Variability of winter wheat grains resistance to static loads

100%

Szot B., Stepniewski A., Rybczynski R.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1993

|

tom 399

255-259

Five winter wheat: Alcedo, Beta, Grana, Liwilla and Salwa in four levels of moisture: 5, 9, 16 and 21 % were examined. Grains came from 1984, 1985 and 1986. Static compression test of a single grain was performed between two parallel plates. Maxial compression force and deformation corresponded to it as well as force and deformation within limits of elasticity were read from the curves in force - deformation coordinate system. Point where curve bent was regard as a limit of elasticity (first failure). Alcedo was the most resistible, while Salwa was the weakest variety. Grains came from 1984 were the strongest and from 1985 were the weakest. Moisture content was the most substantial factor to the strength of wheat grains. With the increase of moisture content maxial compression force decreased, while corresponded deformation increased.

3

Measurement stand for determining the dynamic loads on podded plant seeds

86%

Sosnowski S.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1993

|

tom 399

237-239

In order to test some factors critical for the damage of podded plant seeds it became necessary to design a measurement stand. The basic assumption for the construction of test stand was the ability to impact the seed with various speeds and at various orientations in relation to force direction.

4

Fizjologia odpornosci kielkujacych nasion bobiku i roslin hodowanych in vitro na stresy [termiczne]

86%

Knypl J. S., Kazmierczak A., Bernat T., Radziwinowska-Jozwiak A., Posmyk M.

Biuletyn Naukowy. Akademia Rolniczo-Techniczna w Olsztynie

|

1993

|

tom 12

|

nr 1

87-90

5

Determination of the variability of bean seed mechanical features with a view to minimalizing losses during harvest

86%

Sosnowski S.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1993

|

tom 399

231-236

The present work aims at determining bean seed resistance to mechanical resistance to mechanical damage in relation to moisture content. Another studied aspect was whether repeated wetting and drying of the plant mass as well as dessication could change resistance features of this plant. Two experimental stands were constructed, i.e. for static and for dynamic loading of bean seeds. Studies were conducted on three bean varieties that differed considerably in seed size.

6

Resistance of rape seeds to the impact of dynamic forces

86%

Szwed G., Tys J.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1995

|

tom 427

83-86

Results of investigations on the susceptibility of rape seeds to macro- and microdamage caused by the dynamic contact between seed and metal are presented in this paper. The damage is understood as a disturbance of the continuity of seed tissues as a result of the impact of external mechanical factors. The presence of the damage may cause the initiation of unfavourable chemical and biological reactions inside seeds and, as a consequence, can cause the decrease of their technological and reproductive values. The investigations were carried out with four winter rape varieties taking into consideration the size of seeds, point and energy of impact. An evaluation of macro- and microdamage was made with the method elaborated earlier at the Institute of Agrophysics in Lublin. The investigations show that varietal features significantly differentiate the resistance of seeds to damage. From among varietes under investigation the least resistant to impacts appeared to be Mar and the most resistant - Ceres. It was also found that the point of impact in seed has significant effect on its resistance. It is markedly visible with the smallest seeds (fraction 1.8 mm). Seed damage was evaluated in dependence on a wide range of impact energy (from 0.3 to 1.8 mJ). The results obtained show that small seeds undergo greater damage in comparison to larger ones. It is more visible at higher ranges of impact energy.

7

Naturalne czynniki ksztaltujace odpornosc nasion bobiku na porazenie przez szkodniki

72%

Fornal L., Ciepielewska D., Pierzynowska-Korniak G.

Biuletyn Naukowy. Akademia Rolniczo-Techniczna w Olsztynie

|

1993

|

tom 12

|

nr 1

53-57

8

Po Grainerze rosną do 30% szybciej

72%

Janislawski K.

Tygodnik Poradnik Rolniczy

|

2020

|

nr 07 [821]

9

Wpływ obciążeń dynamicznych na uszkodzenia nasion fasoli

72%

Bieganowski F.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1989

|

tom 365

Соответствующие исследования позволили оценить восприимчивость семян выбранных сортов спаржевой фасоли к механическим повреждениям в условиях разной скорости действия нагрузки. Одновременно установлена значительная сортовая дифференциация исследуемых семян с точки зрения их устойчивости к механическим повреждениям. Наименее устойчивыми оказались семена фасоли сорта Валя (29,4%), а наиболее устойчивыми - семена сорта Злота Сакса (8,4% поврежденных семян в среднем для всего объема исследований). На основании хода изменчивости восприимчивости семян к возника- нию повреждений под влиянием изменений скорости, действия нагрузки и влажности исследуемых семян установлено, что оптимальная влажность, для которой устойчивость семян к повреждениям самая высокая лежит в пределах 21-24%, тогда как скорости действия нагрузок выступающие в машинах по уборке и обмолоту этой культуры должны быть гораздо ниже скорости 17,27 м/сек.

10

Naturalna odpornosc nasion fasoli na porazenie przez strakowca fasolowego [Acanthoscelides obtectus Say.]

72%

Ciepielewska D., Fornal L.

Materiały ... Sesji Naukowej Instytutu Ochrony Roślin

|

1993

|

tom 33

|

nr 2

24-28

11

Susceptibility of rape seeds to dynamic damages depending on moisture and storage time

72%

Szwed G., Tys J.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1995

|

tom 427

87-90

Mechanical properties of winter rape seeds were estimated. Investigated seeds were subjected to various dynamic loads using a measuring stand, whose design and methodical assumptions allowed us to stimulate dynamic loads typical for agricultural threshing and transport machines. In order to determine the influence of moisture on the strength characteristics of seeds, they were moistened for a second time in a ‘Weiss’ climatic chamber. The influence of seeds storage period on their dynamic resistance was estimated. Therefore, fresh-picked and stored for 8 months seeds were used. The studies showed that there is a relationship between the seeds moisture level and their resistance to dynamic loads. Seeds with 6 % moisture loaded with energy of 1 mJ contained 100 % of damages, while the same amount of energy in the sample with 15 % moisture caused only 20 % of damage. Time of storage also affects the strength features of seeds. The seeds tested directly after they had been picked had damage resistance several times higher than the same seeds after a long period of storage with similar moisture during test performance.

12

Factors determining the resistance rape seeds to damage

58%

Stepniewski A., Szot B.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

1995

|

tom 427

51-63

Laboratory studies on rape seeds, conducted at the Institute of Agrophysics, PAS, were aimed at the determination of their strength properties in the aspect of the susceptibility of the seeds to damage. Limit values were determined for loads causing the disruption of the seed cover, with relation to varietal features, agrotechnical measures applied (crop spraying, time of harvest - plant ripeness, sowing density), temperature, and seed moisture content. The value of force causing seed cover cracking, the corresponding strain, or the value of energy and the apparent modulus of elasticity clearly defined the resistance of individual seeds under loading. The mechanical parameters studied were differentiated for particular plant varieties, however, differences in particular years of the study were statistically insignificant, while the differences between successive years of the study but for the same variety were significant. Generally it was observed that seeds of all the varieties in 1993 were more resistant to external loads. No statistically significant changes were observed in seed strength with relation to plant ripeness (time of harvest). Assessing the effect of chemical preparations used for rape spraying, no statistically significant effect on the strength parameters under study was noted for any of the preparations with relation to the control. Experiments concerned with the effect of sowing density on the strength properties of rape seeds did not show any significant differences of the particular parameters with relation to four sowing densities (50, 35, 20 and 10 plants/m²). The strongest differentiation of the properties under study was noted in the case of seeds with increased moisture content. An increase in the seed moisture content was accompanied by a distinct decrease in the values of force, strain, energy, and modulus of elasticity, the greatest decrease in the values of the parameters being observed for moisture content between 11 and 17 %. Also, a significant effect of seed temperature on the strength parameters under study was observed. With increasing temperature, the values of all the parameters decreased. The effect of seed temperature was stronger for diy seeds and decreased with increasing seed moisture content.

13

Natural resistance of phaseolus seed cultivarz to the infestations by bean weevil [Acanthoscelides obtectus Say]

51%

Ciepielewska D., Fornal L.

Acta Academiae Agriculturae ac Technicae Olstenensis. Agricultura

|

1994

|

tom 59

97-105

The resistance of 15 bean cultivars to infestation by bean weevil was studied. The relationships between the number of damaged seeds and such cultivar characters as the thickness of seed coat, seed hardness, starch content, size of starch grains and tannin content were studied. It was found that the seeds of cvs. Bor, Atut and Igołomska, characterized by a low starch content, thick cuticule and testa and a high tanin content, were most resistant to Acanthoscelides.

14

Wplyw regulatorow wzrostu na kielkowanie i wigor nasion oraz zdrowotnosc siewek roslin straczkowych w warunkach stresu chlodnowodnego

44%

Fordonski G., Gorecki R., Bieniaszewski T., Majchrzak B.

Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin

|

1992

|

nr 184

93-103

15

Reakcja dynamiczna nasion na obciazenia udarowe. Teoretyczne i aplikacyjne podstawy

37%

Boguta A.

Acta Agrophysica

|

2002

|

tom 76

1-87

Ograniczanie wyników

A stand for quasi-static loading measurements of seeds

Variability of winter wheat grains resistance to static loads

Measurement stand for determining the dynamic loads on podded plant seeds

Fizjologia odpornosci kielkujacych nasion bobiku i roslin hodowanych in vitro na stresy [termiczne]

Determination of the variability of bean seed mechanical features with a view to minimalizing losses during harvest

Resistance of rape seeds to the impact of dynamic forces

Naturalne czynniki ksztaltujace odpornosc nasion bobiku na porazenie przez szkodniki

Po Grainerze rosną do 30% szybciej

Wpływ obciążeń dynamicznych na uszkodzenia nasion fasoli

Naturalna odpornosc nasion fasoli na porazenie przez strakowca fasolowego [Acanthoscelides obtectus Say.]

Susceptibility of rape seeds to dynamic damages depending on moisture and storage time

Factors determining the resistance rape seeds to damage

Natural resistance of phaseolus seed cultivarz to the infestations by bean weevil [Acanthoscelides obtectus Say]

Wplyw regulatorow wzrostu na kielkowanie i wigor nasion oraz zdrowotnosc siewek roslin straczkowych w warunkach stresu chlodnowodnego

Reakcja dynamiczna nasion na obciazenia udarowe. Teoretyczne i aplikacyjne podstawy