CORN YIELD RESPONSE TO IRRIGATION, PLANT POPULATION AND NITROGEN IN A COOL, HUMID CLIMATE

1986 ◽  
Vol 66 (3) ◽  
pp. 453-464 ◽  
Author(s):  
D. M. BROWN
Keyword(s):  
Zea Mays ◽  
Soil Moisture ◽  
Zea Mays L ◽  
Plant Density ◽  
Plant Population ◽  
Yield Response ◽  
Corn Yield ◽  
Subsequent Paper ◽  
Southern Ontario ◽  
High Plant Density

Summer dry spells in some areas of southern Ontario during the last decade have increased interest in supplemental irrigation. Field studies were conducted in a 2500 heat unit area of southern Ontario on Orthic/Brunisolic Grey Brown Luvisol soils to determine the yield response of field corn (Zea mays L.) to irrigation in midsummer when combined with increased plant density and N rates. The yield responses, phenological records and soil moisture measurements are to be used in the calibration and validation of a corn yield estimation model, to be published in a subsequent paper. Two to four irrigations were applied each year using the line method when soil moisture pressure potential reached −40 to −60 kPa at 22.5 cm depth. Development stages were unaffected by irrigation. Yield increases from irrigation were directly proportional to water applied in midsummer and the intensity of dry weather. Yields increased with plant density in 4 of the 5 yr and were usually consistent over irrigation levels. Additional nitrogen above the recommended rate increased yields in 1982 and 1983, decreased yields in 1981, and resulted in no differences the other two years. In years of positive response to extra nitrogen, there was usually a greater response with irrigation and the responses were greatest at high plant density and for the longer season hybrids. Harvest indices decreased as irrigation amount increased and were exceptionally high in 1983.Key words: Corn, Zea mays L., line-source irrigation, plant population, nitrogen, harvest index

EFFECTS OF PLANT DENSITY ON THE YIELD, MATURITY AND GRAIN CONTENT OF WHOLE-PLANT MAIZE

1981 ◽  
Vol 61 (4) ◽  
pp. 843-849 ◽  
Author(s):  
T.B. DAYNARD ◽  
J.F. MULDOON
Keyword(s):  
Zea Mays ◽  
Leaf Area ◽  
Dry Matter ◽  
Zea Mays L ◽  
Plant Density ◽  
Plant Population ◽  
Southern Ontario ◽  
Small Stature ◽  
Whole Plant ◽  
Density Response

To study the effect of increases in plant density on the dry matter (DM) yield, percentage grain and percentage DM content of whole-plant maize (Zea mays L.), 12 tests were established over a 3-yr period in Central and Southern Ontario. Each test involved three adapted hybrids grown at 50 000, 63 000 and 75 000 plants/ha in 1976, and at these three densities plus 92 000 plants/ha in 1977 and 1978. No hybrid-by-density interaction for DM yield occurred in any test, and the density response was similar for most tests. Maximum DM yield was generally attained once density increased to 63 000 plant/ha. Plant population had a negligible effect on the grain percentage of DM content of forage up to 75 000 plants/ha. Optimum density for DM yield was much lower than expected, given the small stature (i.e., leaf area/plant) of adapted hybrids grown in most of Ontario.

scholarly journals DNA METHYLATION AND FESOD GENE EXPRESSION AFFECTED BY PLANT DENSITY IN ZEA MAYS L.

2019 ◽  
Vol 50 (Special) ◽  
Author(s):  
Shenawa & Alfalahi
Keyword(s):  
Gene Expression ◽  
Dna Methylation ◽  
Zea Mays ◽  
Zea Mays L ◽  
Plant Density ◽  
Maximum Level ◽  
Planting Density ◽  
Gene Copies ◽  
High Plant Density ◽  
Different Response

Methylation Sensitive Amplification Polymorphism (MSAP) was used to characterize the alterations in DNA methylation in maize (Zea mays L.) inbred lines and their half-daillels affected by plant densities (213333 plant h-1 and 13333 plant h-1). The two restriction was enzymes ( HpaII and MspI) succeeded in diagnosing a total of 23 specific loci, most of (22 loci) were Methylation Sensitive Loci (MSL), while the only one NML (No Methylated Loci) was monomorphic. Thirteen out of 22 MSL loci polymorphic, recording a were polymorphism percentage of 59%. Results of FeSOD gene expression cleared the different response of maize inbreds and hybrids to high plant density stress. Generally, the expression of  the targeted gene was increased in plants submitted to high plant density stress compared with low density. The inbred 3 and its single hybrid 1×3 achieved the highest level of gene expression under high planting density (5505.7 and 21098.6 copy, respectively), meanwhile, inbred 5 and it's single hybrid 4×5 gained the maximum level of FeSOD expression at the low plant density (8317.6 and 6862.1 copy, respectively). The response reached to its maximum limit in many of those genotypes, some other genotypes showed relatively steady performance along with higher stress, such as parent 1, that gave the lowest number of gene copies in both, high and low plant density (1375.8 and 1569.5 copy, respectively).

Giant foxtail (Setaria faberi) interference in nonirrigated corn (Zea mays)

Weed Science ◽  
1997 ◽  
Vol 45 (2) ◽  
pp. 256-260 ◽  
Author(s):  
Jason C. Fausey ◽  
James J. Kells ◽  
Scott M. Swinton ◽  
Karen A. Renner
Keyword(s):  
Zea Mays ◽  
Seed Germination ◽  
Seed Production ◽  
Dry Matter ◽  
Plant Density ◽  
Yield Response ◽  
Corn Yield ◽  
Setaria Faberi ◽  
Giant Foxtail ◽  
Inflorescence Length

Studies were conducted at East Lansing, MI, in 1994 and 1995 to examine corn yield response to giant foxtail interference and to examine the effect of giant foxtail density on giant foxtail biomass, seed production, and seed germination. Treatments consisted of 0, 10, 30, 60, 84, and 98 giant foxtail plants m−1of row in 1994 and 0, 10, 27, 30, 60, and 69 plants m−1of row in 1995. The influence of giant foxtail density on corn yield fit a hyperbolic equation. Corn yields were reduced 13% in 1994 and 14% in 1995 from 10 giant foxtail plants m−1of row. Corn dry matter at maturity was decreased 24 and 23% from 10 giant foxtail plants m−1of row in 1994 and 1995, respectively. Giant foxtail seed production increased linearly as inflorescence length increased. The length of a single giant foxtail inflorescence increased as plant density increased and the number of inflorescence produced per plant decreased. Giant foxtail seed production ranged from 518 to 2,544 seeds per plant. Ten giant foxtail plants m−1of row produced 15,700 seeds m−2. Giant foxtail seed germination was not affected by plant density.

Grain Yield Potential of Some Diverse Maize (Zea mays L.) Morphotypes Intercropped with Cocoyam (Xanthosoma sagittifolium)

1985 ◽  
Vol 21 (2) ◽  
pp. 145-152 ◽  
Author(s):  
J. A. Ayuk-Takem ◽  
H. R. Chhedda
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Plant Density ◽  
Plant Population ◽  
Yield Potential ◽  
Maize Cultivars ◽  
Xanthosoma Sagittifolium ◽  
Maize Yields ◽  
Maize Plants ◽  
Erect Leaves

SUMMARYThree maize cultivars, BACOA, SAW and COCA, were evaluated when intercropped with cocoyams at a density of 50 000 maize plants and 10 000 cocoyam stands ha−1. BACOA which matures in 120 days, and SAW (130 days) transmitted significantly more light to the lower canopy than COCA, which has spreading leaves and matures in 150 days. Relative yields for BACOA, SAW and COCA in pure stands were 72, 100 and 85%, respectively, while those for cocoyams in BACOA/cocoyam, SAW/cocoyam and COCA/cocoyam mixtures were 82, 58 and 54%, respectively, showing that COCA significantly suppressed the yield of cocoyam when intercropped.Yields of a COCA type with erect leaves increased as plant density increased from 20 000 to 50 000 plants ha−1 in pure stands, while yields of COCA with spreading leaves increased as plant density increased from 20 000 to 40 000 plants ha−1 but decreased when plant population increased to 50 000 plants ha−1. When COCA with erect leaves was intercropped with cocoyams, cocoyam tuber yields were fairly stable and maize yields continued to increase significantly as plant density increased from 20 000 to 50 000 plants ha−1, whereas the yields of COCA with spreading leaves and cocoyams were greatly reduced when intercropped and when the plant population increased from 20 000 to 50 000 plants ha−1.

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