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Titolo:
PECULIARITIES OF YIELD FORMATION OF RYE V ARIETIES
Autore:
CAPOUCHOVA I; PETR J; SKERIK J;
Indirizzi:
CZECH UNIV AGR PRAGUE 16521 6 CZECH REPUBLIC
Titolo Testata:
Rostlinna vyroba
fascicolo: 1, volume: 44, anno: 1998,
pagine: 31 - 38
SICI:
0370-663X(1998)44:1<31:POYFOR>2.0.ZU;2-0
Fonte:
ISI
Keywords:
RYE; HYBRID VARIETIES; POPULATION VARIETY; SOWING RATES; YIELD FORMATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
I. Capouchova et al., "PECULIARITIES OF YIELD FORMATION OF RYE V ARIETIES", Rostlinna vyroba, 44(1), 1998, pp. 31-38

Abstract

The trials with hybrid rye varieties Rapid, Marder and Locarno and classic population of the rye variety Dankovske nove were conducted to study the yield formation of the varieties at the different sowing rate(100, 200, 300, 400 and 500 germinating grains per 1 m(2) in hybrid varieties, and 300, 400 and 500 germinating grains per 1 m(2) in the population variety), and hence the different density and organization ofthe stand. At different sowing rate the reduction of the number of plants was different and this was rising with increasing density of the stand. The lowest decline of plants was recorded in thinnest sowing rates, greatest in highest sowing rates. At different stand density other yield components - number of stems (tillers) and spike productivity - were also formed in a different way. In both experimental years the greatest number of tillers per plant in hybrid varieties at lowest sowing rates 100 and 200 germinating grains per 1 m(2) was found. At the sowing rate of 300 germinating grains per 1 m(2) the number of tillersin hybrid varieties was similar to that of the population variety. Using higher sowing rates (400 and 500 germinating grains per 1 m(2)), however, hybrid varieties responded by a marked decrease in these values. At different sowing rate a different number of bases of future double-flowered spikelets was established what expresses a potential spikeproductivity. The effect of the law of compensation was again manifested when spikes of low potential productivity were established in thick stands in early stages of the growth and development (stage 31 DC and Va stage of organogenesis). The highest yields in the studied set were obtained in both experimental years 1995 and 1996 by hybrid varieties at sowing rates of 200 and 300 germinative grains per 1 m(2). When higher sowing rates were used (400 and 500 germinative grains per 1 m(2)), hybrid varieties responded by statistically significant decrease of yields. In the variety Dankovske nove the sowing rate of 400 germinative grains per 1 m(2) seemed to be the best in both years, the differences in yields among different sowing rates 300, 400 and 500 germinative grains per 1 m(2) were statistically insignificant. This indicates greater sensitivity of rye hybrid varieties to over-density of the stand and lower autoregulation capacity when compared with the traditional population varieties. The structure of the yield indicated that the principle of higher yield capacity of rye hybrid varieties compared with population varieties consists as in higher and more productive tillering, as in higher spike productivity. In optimum sowing rates for hybrid varieties (200 to 300 germinative grains per 1 m(2)) an averagenumber of grains per spike in them ranged around 60 in 1995 and around 58 in 1996. This resulted in high values of the number of grains perarea unit at relatively good level of caryopsis weight. Increased number of grains per spike was allowed in hybrid varieties by greater assimilation area per one established spikelet. In the population varietyDankovske nove average number of grains per spike was significantly lower - at the sowing rate of 400 germinative grains per 1 m(2) in which this variety reached highest yields in both experimental years, thiswas even 49 grains in 1995 and 44 grains in 1996.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 08:53:30