Effects of Plant Density on Agronomic Traits and Yield in Spring Maize Zhongdan 909 and Their Regional Differences in Northeast China

Abstract Climate warming has a great impact on grain production in northeast China, but there are few studies on the temporal and spatial variation characteristics of annual Tmean (mean temperature), the impact of meteorological factors on Tmean, and the impact of Tmean increase on grain production in northeast China. This study found that annual Tmean decreased from southeast to northwest in Northeast China, and there were regional differences in spatial distribution. The annual Tmean isoline in Northeast China moves obviously from southeast to northwest. The annual warming trend of Tmean was significant from 1971 to 2000, and moderated from 2001 to 2020. In recent 50 years, Tmean had obvious periodic changes. In the mid-late 1980s, annual Tmean had a sudden warming change, and since then it has been rising continuously. Sunshine hours, average wind speed, evaporation and average air pressure had a very significant correlation with Tmean. In conclusion, the climate change in northeast China in the past 50 years has an obvious warming and drying trend, and there are regional differences in the warming and drying. The warming and drying climate has brought challenges to agricultural production and food security in Northeast China. However, the negative effects of grain production reduction caused by warming and drying climate can be avoided to a certain extent if we deal with it properly.

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EFFECT OF PLANT DENSITY ON THE AGRONOMIC PERFORMANCE OF SUNFLOWER ON DRYLAND

Canadian Journal of Plant Science ◽

10.4141/cjps84-084 ◽

1984 ◽

Vol 64 (3) ◽

pp. 599-605 ◽

Cited By ~ 7

Author(s):

N. W. HOLT ◽

S. J. CAMPBELL

Keyword(s):

Helianthus Annuus ◽

Seed Weight ◽

Oil Content ◽

Seed Oil ◽

Plant Density ◽

Agronomic Traits ◽

Agronomic Performance ◽

Head Diameter ◽

Helianthus Annuus L ◽

Days To Maturity

This study investigated the influence of plant density on several agronomic traits of four sunflower (Helianthus annuus L.) cultivars grown at Indian Head and Saskatoon, Saskatchewan in the semiarid prairies. At populations of 40 000–85 000 plants∙ha−1, plant density had no significant effect on seed yield. The increase in percentage oil content with increase in plant density (44.3–45.6%) was small but significant. As plant density was increased, days to flower, height and test weight increased while days to maturity, head diameter and average seed weight decreased. Cultivars × density interactions were generally not significant. Environment (five location-years) had a significant effect on all variables, and environments × cultivar interactions were significant for most of these. Results of this experiment indicated that testing of sunflower lines at several locations in the growing area would be necessary for best assessment but one plant density, suitable to that area, could be used.Key words: Sunflower, plant density, seed, oil, seed size, Helianthus annuus L.

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Potassium accumulation, partitioning, and remobilization in high-yield spring maize in Northeast China

Journal of Plant Nutrition ◽

10.1080/01904167.2019.1609501 ◽

2019 ◽

Vol 42 (11-12) ◽

pp. 1366-1377 ◽

Cited By ~ 2

Author(s):

Geng Yuhui ◽

Cao Guojun ◽

Wang Lichun ◽

Wang Shuhua

Keyword(s):

Northeast China ◽

High Yield ◽

Potassium Accumulation ◽

Spring Maize

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Predicting the genetic gain in the Brazilian white maize landrace

Ciência Rural ◽

10.1590/s0103-84782009000100004 ◽

2009 ◽

Vol 39 (1) ◽

pp. 19-24 ◽

Cited By ~ 7

Author(s):

Ana Raquel Ribeiro e Souza ◽

Glauco Vieira Miranda ◽

Messias Gonzaga Pereira ◽

Leandro Vagno de Souza

Keyword(s):

Genetic Variability ◽

Grain Yield ◽

Genetic Gain ◽

Plant Density ◽

Production Systems ◽

Agronomic Traits ◽

Minas Gerais ◽

Phenotypic Variance ◽

Environment Interaction ◽

Maize Landrace

The objectives of this research were to evaluate the genetic variability and predict genetic gain in the white maize landrace rescued in Barbacena, Minas Gerais, Brazil. The Brazilian maize landraces have economic and social importance for certain areas in Brazil, and research on this germplasm is very important for local food security. Three experiments were carried out with 100 half-sib progenies, in Campos dos Goytacazes, RJ, Coimbra and Barbacena, Minas Gerais, Brazil. These sites were chosen for their soil and climatic differences. An analysis of variance was significant among the progeny for all characters, indicating the presence of genetic variability between the three populations. In Campos dos Goytacazes and Coimbra, the genetic variation of the white maize landrace was responsible for most of the phenotypic variance in grain yield and can be used in selection cycles. There was no significant genetic variance in grain yield in Barbacena. For the white maize landrace it was concluded that: the characters of the component of productivity such as plant density and number of plants with kernels can produce indirect genetic gain for grain yield and are suitable for breeding; prebreeding of the maize landrace is necessary before being used directly in the elite germplasm; the population contains high genetic variability and opportunities for genetic gain; the average agronomic traits are suitable only for traditional production systems with few inputs, and polyculture; the difference between environments produces specific responses in the progeny i.e. there is a progeny x environment interaction.

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