scholarly journals How delaying post-silking senescence in lower leaves of maize plants increases carbon and nitrogen accumulation and grain yield

2021 ◽  
Author(s):  
Rongfa Li ◽  
Dandan Hu ◽  
Hao Ren ◽  
Qinglong Yang ◽  
Shuting Dong ◽  
...  
Keyword(s):  
Grain Yield ◽  
Nitrogen Accumulation ◽  
Carbon And Nitrogen ◽  
Maize Plants

Correlative Analysis of Yield and its Components in Maize

1974 ◽  
Vol 10 (2) ◽  
pp. 81-86 ◽  
Author(s):  
K. P. Prabhakaran Nair ◽  
R. P. Singh
Keyword(s):  
Grain Yield ◽  
Yield Components ◽  
Negative Influence ◽  
Nitrogen Accumulation ◽  
Nitrogen Application ◽  
Thousand Grain Weight ◽  
N Application ◽  
Correlative Analysis ◽  
Local Cultivar ◽  
Improvement Programme

SUMMARYAt Pantnagar, India, linear response in maize to nitrogen application was observed up to 150 kg. of N/ha. with some of the most promising hybrids and composites released by the All India Co-ordinated Maize Improvement Programme. Increase in grain yield, and total nitrogen accumulation in grain, were substantially more in Ganga 2 than in the local cultivar or the composites, at higher rates of N application. In absolute terms, the local cultivar accumulated more nitrogen in its grain, but the relative amounts declined at higher rates of N application. Among the yield components influencing ultimate grain yield, barrenness exerted a negative influence on grain yield through the number of cobs per plot. Among cob characters, such as thousand grain weight and number of grains per cob, the former exerted a substantial influence on grain yield.

THE RELATIONSHIP BETWEEN FINAL YIELD AND PHOTOSYNTHESIS AT FLOWERING IN INDIVIDUAL MAIZE PLANTS

1979 ◽  
Vol 59 (3) ◽  
pp. 585-601 ◽  
Author(s):  
G. O. EDMEADES ◽  
T. B. DAYNARD
Keyword(s):  
Grain Yield ◽  
Shoot Growth ◽  
Plant Density ◽  
Meteorological Data ◽  
Dry Weight ◽  
Plant Variation ◽  
Final Yield ◽  
Black Layer ◽  
Maize Plants ◽  
The Relationship

In an attempt to explain plant-to-plant variation in dry weight of maize (Zea mays L.), a computer program was developed to predict daily assimilation per plant and its distribution throughout the shoot at flowering. Inputs to the model were meteorological data, photosynthetic rate-irradiance curves, measurements of intraplant assimilate distribution at flowering, and the positions of individual leaves of plants grown in the field at three densities (50 000, 100 000 and 150 000 plants/ha). Dry weights were recorded on these same plants following black layer formation. Predicted effects of plant density on shoot growth compared favorably with available data. The correlation coefficient between predicted assimilation 1 day after anthesis and grain yield on the same plants, with treatment effects removed, was 0.67 (N = 360). The coefficient of variation of predicted assimilate flux per plant increased significantly with increasing density, and the fluxes were generally normally distributed. Results supported the concept of a threshold assimilation rate per plant below which grain would not normally form, and this appears to be the cause of the bimodal frequency distribution of grain yield per plant observed at high densities.

Shade stress decreased maize grain yield, dry matter, and nitrogen accumulation

2020 ◽  
Vol 112 (4) ◽  
pp. 2768-2776
Author(s):  
Jia Gao ◽  
Zheng Liu ◽  
Bin Zhao ◽  
Shuting Dong ◽  
Peng Liu ◽  
...  
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Nitrogen Accumulation ◽  
Maize Grain Yield ◽  
Maize Grain

Fertility investigations on the black earth wheatlands of the Darling Downs, Queensland. III. Mineral nitrogen in the soil and its relation to the wheat crop

1960 ◽  
Vol 11 (1) ◽  
pp. 27 ◽  
Author(s):  
SA Waring ◽  
LJH Teakle
Keyword(s):  
Grain Yield ◽  
Ammonia Nitrogen ◽  
Mean Value ◽  
Mineral Nitrogen ◽  
Wheat Crop ◽  
Nitrogen Accumulation ◽  
A Value ◽  
The Mean ◽  
The One ◽  
Growing Crop

The level of mineral nitrogen in the soil under fallow and crop was measured for the years 1951 to 1953. Relationships of mineral nitrogen at planting to yield and nitrogen content of wheat grain and straw were examined. Values for nitrate nitrogen at the end of the fallow period ranged most commonly from 10 to 20 µg/g in the surface 2 ft and from 0 to 10 µg/g at 2-4 ft. Approximately one-third of the sites showed an increase from the third to the fourth foot. One site showed extremely high values throughout the profile, particularly at 3-4 ft where a value of 127 µg/g was recorded. Values for ammonia nitrogen were most commonly in the range of 0-3 µg/g . Under the growing crop, mineral nitrogen declined for most depths in the period from planting up to September or October, after which there was little further change to harvest. Uptake of mineral nitrogen was normally greatest from the surface 2 ft of soil. Below 3 ft there were two groups of sites. One group showed moderate to high uptake and the second group low uptake. The low uptake in the latter group provides a reason for mineral nitrogen accumulation below 3 ft at some sites. Mineral nitrogen to 4 ft at planting averaged 126 lb/ac, excluding the one site with exceptionally high values. This was double the mean value of 63 lb/ac for nitrogen recovered in grain and straw, for crops planted in May-June. These figures, combined with trends in the soil under crop, suggest that most of the nitrogen used by the crop was derived from that in the soil at planting. Correlations between mineral nitrogen at planting and grain yield were mostly non-significant, suggesting that in general nitrogen was not an important factor limiting yield. Low grain yield and protein percentage were recorded at a number of sites which had been cultivated more than 50 years.

Fallowing and wheat production in southern NSW

1966 ◽  
Vol 6 (22) ◽  
pp. 233 ◽  
Author(s):  
GD Kohn ◽  
RR Storrier ◽  
EG Cuthbertson
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Mineral Nitrogen ◽  
Yield Response ◽  
Winter Period ◽  
Wagga Wagga ◽  
Nitrogen Accumulation ◽  
High Fertility ◽  
Available Nitrogen ◽  
Nitrogen Concentrations

The response of wheat to the length of fallow, to the number of cultivations, and to pre-planting chemical control of weeds on high fertility soils was determined under winter rainfall conditions at Wagga Wagga, New South Wales, over four years commencing 1960-61. Length of fallow had little influence on the conservation of rainfall except in 1961-62, when approximately twice the average summer rainfall added 1.8 inches of soil moisture per acre 48 inches. Long fallow increased available nitrogen accumulation, but this did not increase yield over either the mechanically prepared shorter fallows, or pre-planting chemical weed control. This was due to losses during the autumn-winter period of some of the excess mineral nitrogen that accrued during the long fallow. High mineral nitrogen concentrations also occurred during the summer on weed-free, uncultivated soils. Grain yield after a single autumn cultivation was as high as after a long fallow except in 1961-62. In this year the long fallow (September to May) significantly increased yields over all other treatments. The absence of any positive yield response to the application of 60 to 80 lb nitrogen an acre to short fallows suggests that mineral nitrogen concentrations were generally adequate for grain production. The addition of nitrogen to long fallows often depressed yields. The dependence of grain yield on adequate weed control is illustrated by a highly significant negative correlation (r = -0.849 ; P<0.001) of grain yield with weed growth. It is concluded that in the Wagga Wagga environment weed control is more important than moisture conservation and mineral nitrogen accumulation through fallowing.

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