scholarly journals Crop Injury from Sublethal Rates of Herbicide. II. Cucumber

HortScience ◽  
2001 ◽  
Vol 36 (4) ◽  
pp. 674-676 ◽  
Author(s):  
James P. Gilreath ◽  
Carlene A. Chase ◽  
Salvadore J. Locascio
Keyword(s):  
Developmental Stages ◽  
Total Yield ◽  
Field Studies ◽  
Growth And Yield ◽  
Fresh Weight ◽  
Stages Of Development ◽  
Plant Vigor ◽  
Stage 4 ◽  
Stage 1 ◽  
Dichlorophenoxy Acetic Acid

Cucumber (Cucumis sativus L.) growth and yield in response to application of sublethal rates of 2,4-D at several developmental stages were evaluated in field studies during two seasons. In Expt. 1, prebloom applications of 2,4-D amine reduced plant vigor and increased foliar epinasty as rates increased from 0 to 112 g·ha-1. Early and total fruit yields also declined linearly as 2,4-D rates increased; 112 g·ha-1 2,4-D reduced early yield by 25% and total yield by 20%. In Expt. 2, plant vigor declined with increasing rates of 2,4-D applied at all four stages of development from first true leaf to early fruit enlargement; however, response at stage 1 differed with time after application. Epinasty increased with 2,4-D rate when applied at all developmental stages; however the severity of the response varied with time after application for stages 1, 2, and 3, but not for stage 4. Averaged over all developmental stages, vine length, fresh weight, and yield decreased linearly as rates increased. Early and total yields with 112 g·ha-1 were 22% and 19% lower than those of nontreated plants, respectively. Growth inhibition and yield decline, pooled across 2,4-D rates, were greater when exposure occurred at the earlier stages of development. Chemical name used: (2,4-dichlorophenoxy)acetic acid (2,4-D).

scholarly journals Source-Sink Relationship and Protea Postharvest Leaf Blackening

1995 ◽  
Vol 120 (3) ◽  
pp. 475-480 ◽  
Author(s):  
Jingwei Dai ◽  
Robert E. Paull
Keyword(s):  
Respiration Rate ◽  
Developmental Stages ◽  
Sucrose Solution ◽  
Soluble Solids ◽  
Fresh Weight ◽  
Nectar Production ◽  
Total Soluble Solids ◽  
Stage 4 ◽  
Stage 1 ◽  
Source Sink

The inflorescence of Protea neriifolia B. Br. was two-thirds of the total cut floral stem fresh weight and significantly influenced blackening of the attached 20 to 30 leaves. Floral stems harvested at five developmental stages were characterized for inflorescence diameter, fresh and dry weights, respiration, and nectar production. Inflorescence diameter and fresh and dry weights increased from stage 1 (very tight bud) to stage 5 (bracts reflexed). Respiration rate was high in stages 1 and 3. Nectar production began at stage 4 (open, cylindrical flower) and increased from 2.7 to 9.8 ml per flower with 15% to 23.5% total soluble solids as the flower opened. Postharvest inflorescence diameter, respiration rate, and nectar production increased and leaf blackening decreased when floral stems were placed in 5% (w/v) sucrose solution. Application of 14C-sucrose to a leaf subtending the inflorescence lead to >50% of the radioactivity being found in the nectar within 24 hours. These data indicate that leaf blackening in protea is the result of depletion of carbohydrate by the inflorescence, and that this depletion is primarily due to the sugar demand for nectar production.

Effects of Simulated MSMA Drift on Rice (Oryza sativa) Growth and Yield

Weed Science ◽  
1981 ◽  
Vol 29 (3) ◽  
pp. 303-308 ◽  
Author(s):  
E. P. Richard ◽  
H. R. Hurst ◽  
R. D. Wauchope
Keyword(s):  
Oryza Sativa ◽  
Gossypium Hirsutum ◽  
Plant Height ◽  
Weed Control ◽  
Developmental Stages ◽  
Growth And Yield ◽  
Stages Of Development ◽  
Early Season ◽  
Application Timing ◽  
Over The Top

Levels of MSMA (monosodium methanearsonate) that simulated drift (0.2, 0.39, and 0.78 kg/ha) were applied over-the-top to rice (Oryza sativaL. ‘Vista’, ‘Starbonnet’, or ‘Labelle’) after flooding at four developmental stages between early tillering and late jointing. The MSMA rates used were equivalent to, or lower than, the 0.78-kg/ha rate that would be applied as an over-the-top application to cotton (Gossypium hirsutumL.) for early season weed control. Over-the-top applications of MSMA did not affect heading and maturity dates of filled grains regardless of the rate or application timing. Reductions occurred, however, in plant height, number of panicles, and yield. In addition, the percentage of erect panicles showing typical “straighthead” symptoms increased. Rice sensitivity to MSMA depended on MSMA rate and stage of growth with injury being most severe as rice approached the reproductive stages of development. Because aerial applications of MSMA to cotton are normally made before rice reaches the reproductive stage, injury resulting from MSMA drift should be minimal.

scholarly journals Enhanced Infection of Peanut, Arachis hypogaea L., Seeds With Aspergillus flavus Group Fungi Due to External Scarification of Peanut Pods by the Lesser Cornstalk Borer, Elasmopalpus lignosellus (Zeller)1

1991 ◽  
Vol 18 (2) ◽  
pp. 110-116 ◽  
Author(s):  
Robert E. Lynch ◽  
David M. Wilson
Keyword(s):  
Arachis Hypogaea ◽  
Aspergillus Flavus ◽  
Developmental Stages ◽  
Field Studies ◽  
Larval Feeding ◽  
Arachis Hypogaea L ◽  
Stage 4 ◽  
Elasmopalpus Lignosellus ◽  
Group A ◽  
Aspergillus Flavus Group

Abstract The relationship between injury by the lesser cornstalk borer (LCB), Elasmopalpus lignosellus (Zeller), and invasion of peanut, Arachis hypogaea L., pods and seeds by species of the Aspergillus flavus group (A. flavus Link and A. parasiticus Speare) were studied under laboratory and field conditions. In the laboratory, LCB larvae were an excellent vector of an A. parasiticus color mutant (ATCC 24690) to all developmental stages of peanut pods. Fungal invasion and aflatoxin concentration in seeds were higher in immature pods (stage 2–3) than in more mature pods (stage 4–6). Contamination of seeds with ATCC 24690 was directly related to the extent of pod injury by larvae of the LCB. In field studies, over 50% of the LCB larvae collected from peanut were naturally contaminated with species of the A. flavus group. The planting date and harvest date of peanut had little influence on the incidence of fungal contamination of pods and seeds, or on aflatoxin content in seeds. However, increased pod injury by the LCB significantly increased the percentage of seeds infected with species of the A. flavus group. Seeds in pods with only external scarification from larval feeding had a significantly higher percentage of A. flavus group infection than seeds from uninjured pods. Therefore, infection and contamination of visibly uninjured seeds with aflatoxigenic fungi were enhanced by external injury to peanut pods by the LCB.

scholarly journals The effects of goat manure and sugarcane molasses on the growth and yield of beetroot (Beta vulgaris L.)

2020 ◽  
Vol 65 (4) ◽  
pp. 321-335
Author(s):  
Priyadarshani Nadeeka ◽  
Thayamini Seran
Keyword(s):  
Beta Vulgaris ◽  
Total Yield ◽  
Growth And Yield ◽  
Control Treatment ◽  
High Yield ◽  
Sugarcane Molasses ◽  
Root Yield ◽  
Fresh Weight ◽  
Significant Difference ◽  
Goat Manure

A pot experiment was conducted to study the effect of goat manure and sugarcane molasses on the growth and yield of beetroot (Beta vulgaris L.) in sandy regosol. The experiment was laid out in a completely randomized design (CRD) with six treatments. The treatments included inorganic fertilizer (T1), 10 t/ha of goat manure alone (T2) and also 10 t/ha of goat manure and 50% triple superphosphate (TSP) with 1-4 t/ha of sugarcane molasses (T3-T6). The results showed that plant growth parameters (leaf length, leaf petiole length, leaf width, leaf number, fresh weight and dry weight of leaves) were significantly varied among the treatments. There was a significant difference in the diameter of beetroot among the treatments. Significant differences (P<0.05) were observed in fresh weight of beetroot and total plant among the treatments. Fresh weight of root yield and total yield of beetroot per plant were increased in 10 t/ha goat manure, 2 t/ha sugarcane molasses and 50% TSP (T4) and 10 t/ha goat manure, 3 t/ha sugarcane molasses and 50% TSP (T5) when compared to the control treatment (T1). The total yield of beetroot per m2 was 1,792.62 g in T4 and 1,402.68 g in T1. The root yield of beetroot was increased in T4 in comparison to T5. It can be concluded that 10 t/ha of goat manure with 2 t/ha of sugarcane molasses and 50% TSP could be applied for obtaining a high yield of beetroot in sandy regosol.

scholarly journals PENGARUH SUBSTITUSI SERBUK ECENG GONDOK DAN AMPAS TEMPE TERHADAP PRODUKSI JAMUR TIRAM PUTIH (Pleurotus ostreatus)

2021 ◽  
Vol 46 (1) ◽  
pp. 78
Author(s):  
Syiwi Ratri Indriyani ◽  
Rommy Andhika Laksono ◽  
Kasdi Pirngadi
Keyword(s):  
Pleurotus Ostreatus ◽  
Water Hyacinth ◽  
Block Design ◽  
Total Yield ◽  
Growth And Yield ◽  
Oyster Mushroom ◽  
Basic Material ◽  
Fresh Weight ◽  
Harvest Intensity ◽  
Randomized Block Design

In general, the basic material used in the planting media of white oyster mushroom is sawdust. The increasing need for sawdust, without being offset by sufficient availability will make sawdust difficult to obtain. The research aimed to obtain the composition substitution of the hyacinth powder and tempe dregs which provided the highest results for growth and yield of white oyster mushroom (Pleurotus ostreatus). The research was conducted in Gintung Kerta Village, Klari Subdistrict, Karawang District, West Java from July 2020 to October 2020. The method used was an experimental method with used Randomized Block Design (RDB) single factor, consisting of 9 treatments and 3 replications so there were 27 experimental units. The treatments were: A (without the addition of growing media treatment); B (5% water hyacinth powder); C (10% water hyacinth powder); D (15% water hyacinth powder; E (20% water hyacinth powder); F (Tempe dregs 5%); G (Tempe dregs 10%); H (Tempe dregs 15%); and I (Tempe dregs 20%). The results showed that there was a significant effect of composition proportion substitution of the hyacinth powder and tempe dregs on the length of mycelium per baglog, maximum fruit hood diameter per baglog, harvest intensity per baglog, fresh weight of mushrooms per baglog, and total yield in a planting period. The treatment of H (Tempe dregs 15%) gave the highest yield to the harvest intensity of 2.44 times, the mushroom fresh weight of 89.42 g/baglog, and the total yield in a planting period of 408.00 g.

Chemical Control of Canada Thistle

Weed Science ◽  
1975 ◽  
Vol 23 (2) ◽  
pp. 116-118 ◽  
Author(s):  
A. G. Carson ◽  
J. D. Bandeen
Keyword(s):  
Acetic Acid ◽  
Propionic Acid ◽  
Chemical Control ◽  
Field Studies ◽  
Cirsium Arvense ◽  
Canada Thistle ◽  
Stages Of Development ◽  
Anisic Acid ◽  
Dichlorophenoxy Acetic Acid

Field studies were conducted to evaluate the effectiveness of one, two, and three annual applications of atrazine [2-chloro-4-(ethylamino) −6-(isopropylamino)-s-triazine], 2,4-D [(2,4-dichlorophenoxy) acetic acid], dicamba (3,6-dichloro-o-anisic acid), and a three way mix of dicamba, mecoprop [2-[(4-chloro-o-tolyl) oxy]propionic acid], and 2,4-D at a ratio of 7:5:20 at different stages of development for the control of Canada thistle [Cirsium arvense(L.) Scop.]. Two consecutive annual applications in all atrazine treatments achieved the same level of control as cultivation every 5 weeks. In the year of the last treatment, Canada thistle was controlled with two or more consecutive annual applications of the hormone-type herbicides (2,4-D, dicamba, and the three way mix); however, in the year following the last treatment, regrowth occurred.

Floral Initiation and Development in Helipterum roseum (Hook.) Benth. And Helichrysum bracteatum (Vent.) Andrews (Asteraceae)

1988 ◽  
Vol 36 (5) ◽  
pp. 575 ◽  
Author(s):  
KV Sharman ◽  
M Sedgley
Keyword(s):  
Apical Meristem ◽  
Developmental Stages ◽  
Involucral Bract ◽  
Floral Initiation ◽  
Naked Eye ◽  
Sequence Of Events ◽  
Stage 4 ◽  
The Individual ◽  
Stage 1 ◽  
Helichrysum Bracteatum

Floral initiation and development in Helichrysum bracteatum and Helipterum roseum were investigated by scanning electron microscopy. The sequence of events in these two species was similar and occurred rapidly. Seven stages in apical development were identified, which were distinctive in both appearance and size. Stage 1 was a small vegetative meristem with 2-4 leaf primordia. Stage 2 (also vegetative) was characterized by a doubling in both height and diameter. A doming of the apical meristem signified the commencement of stage 3, and at the appearance of the first involucral bracts (stage 4) the apex had further tripled in height and doubled in diameter. This was followed by the appearance of floret primordia (stage 5). By the time the inflorescence buds were visible to the naked eye (stage 6) several rows of florets were present, and at anthesis (stage 7) the capitulum was covered with florets. During the transition from stage 4 to stage 5 a few developing primordia appeared to divide. The lower portion developed into a small involucral bract and the upper portion into a floret. The florets developed centripetally such that a range of developmental stages was present on the capitulum. The development of the individual florets involved the differentiation of perianth, anther, pistil and pappus hairs. Stage 4 was considered the point at which the apex was committed to flower.

scholarly journals 454 Effect of Tuber Cutting and Planting Dates on Growth and Yield of Some Potato Cultivars

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 472B-472
Author(s):  
M.M.A. Abdalla ◽  
A.M.A. Butt ◽  
A.M. El-Damarany ◽  
S.M.A. Mckhaiel
Keyword(s):  
Total Yield ◽  
Planting Date ◽  
Growth And Yield ◽  
Stem Length ◽  
Fresh Weight ◽  
Planting Dates ◽  
Emergence Percentage ◽  
Plant Stand ◽  
Number Of Stems ◽  
Rate Of Emergence

This work was performed at the Experimental Farm of the Faculty of Agriculture Assiut Univ. during two fall seasons (1995–1996 and 1996–1997) to study the effect of planting date, cultivar, and seed cutting on the growth and yield of potato. A factorial experiment was designed. All data was subjected to statistical analysis. The results indicate that there is a significant effect for all the studied factors on the growth and yield of potato. The data also indicate that planting on 1 Oct. or 1 Nov. showed higher emergence percentage, total yield, final plant stand, rate of emergence, and height and number of stems. `Spunta' produced the highest stem length, fresh weight per plant, and total yield. Whole tubers gave higher stem length, plant fresh weight, tuber weight, and tuber number per hill.

scholarly journals Effects of Preplant Nitrogen and Sulfur Fertilizer Sources on Strawberry

2010 ◽  
Vol 20 (1) ◽  
pp. 193-196 ◽  
Author(s):  
Bielinski M. Santos
Keyword(s):  
Ammonium Sulfate ◽  
Nitrate Leaching ◽  
Total Yield ◽  
Sandy Soils ◽  
Field Studies ◽  
Fruit Weight ◽  
Growth And Yield ◽  
Appropriate Use ◽  
Leaching Potential ◽  
Marketable Fruit

Field studies were conducted to determine effects of preplant nitrogen (N) and sulfur (S) sources on ‘Strawberry Festival’ strawberry (Fragaria ×ananassa) growth and yield. Six treatments resulted from the preplant application of ammonium nitrate [AN (34% N)], ammonium sulfate [AS (21% N and 24% S)], ammonium sulfate nitrate [ASN (26% N and 14% S)], polymer-coated AS [PCAS (20% N and 23% S)], and elemental S (90% S). A nontreated control was added. The N was fixed at 50 lb/acre for AN, AS, ASN, and PCAS, which resulted in S rates of 0, 57, 27, and 57 lb/acre, respectively. The S rate of the elemental S treatment was set at 57 lb/acre. For early fruit number, the highest values were found in plots treated with AS and elemental S, while the highest total fruit numbers were obtained in plots treated with AS, ASN, PCAS, and elemental S. There was no difference in total fruit numbers between the nontreated control and AN. Plots treated with elemental S, PCAS, ASN, and AS had the highest early marketable fruit weights, whereas the lowest early marketable fruit weight was found in the nontreated plots. In comparison with the nontreated control plots, all the preplant fertilization programs improved early marketable fruit weight, with AN, AS, ASN, PCAS, and elemental S. Total marketable fruit weights were maximized in plots treated with preplant AS, ASN, PCAS, or elemental S. There was no difference between the total fruit weights obtained in the control and AN-treated plots. The data indicated that the strawberry total yield increases can be attributed to the use of preplant fertilizer sources containing S. This research may lead to a more appropriate use of N for strawberry production in Florida, minimizing the nitrate-leaching potential in high sandy soils by eliminating N sources from preplant fertilization programs.

scholarly journals The Effect of Planting Distance and Spraying with Different Concentrations of (Micronate15) on Vegetative Growth and Yield Traits of Pea Plant (Pisum Sativum L.)

2018 ◽  
Vol 3 (2) ◽  
pp. 13-19 ◽  
Author(s):  
Ismael Ahmad Hassan
Keyword(s):  
Vegetative Growth ◽  
Foliar Application ◽  
Growth Traits ◽  
Total Yield ◽  
Growth And Yield ◽  
Fresh Weight ◽  
Number Of Leaves ◽  
Planting Distance ◽  
Number Of Seeds ◽  
Number Of Branches

The aim of this study was to find the effect of planting distances and spraying with different concentrations of leaf fertilizer with micronate15 on some vegetative growth traits and yield of pea variety Green Canada in non-heated greenhouses, by using three planting distance (factor A) which includes:  A1:20, A2: 30, and A3:40 cm and four spray concentrations as foliar application (factor B) which includes: B0: zero, B1: 0.5, b2: 1.5 and b3: 2.5 liter of water). According to the results of this study the highest plant (124.82cm), number of branches (4.58), fresh weight,(95.94 g) and the total yield (142.41 g)were observed in the distance of planting (30 cm), while the highest value of the pod length was observed from the distance planting in 40 cm which is 8.39 cm. The concentration of 1.5 mL / liter of micronate15 gave the highest values of branches 4.53 branches, fresh weight 97.47 g, number of pods 36.73 pods, number of seeds 8.55 oats, length of the pod 8.83 cm and the total yield 150.78 g. The highest values of the number of branches 5.14 branch, fresh weight 105.72 g, the number of seeds 8.90 seed and the total yield 159.78 g were observed from the interaction between the planting distance of 30 cm and 1.5 mL / liter of nutrient micronate15. Also, the interaction between   20 cm distance and foliar application with 2.5 mL l of micronate15 gave the highest value in the number of leaves which is 53.36.

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