scholarly journals IMPACT OF WEEDS TO SUNFLOWER UNDER ZERO TILLAGE AND PHOSPHORUS FERTILIZATION

2019 ◽  
Vol 50 (6) ◽  
Author(s):  
Mohammed & et al.
Keyword(s):  
Seed Yield ◽  
Dry Weight ◽  
Phosphorus Fertilization ◽  
Weed Competition ◽  
No Tillage ◽  
Zero Tillage ◽  
Phosphorus Fertilizer ◽  
College Of Agriculture ◽  
Weed Density ◽  
Alternative Site

In order to investigate the effect of no tillage compared with the conventional cultivation and phosphorus fertilization (100, 200 and 300 kg ha-1) P2O5 to the weeds grown in the sunflower field variety Aqmar, a field trial was conducted at the experimental farm (alternative site of College of Agriculture- University of Baghdad) Abu- Ghraib during the spring and fall seasons of 2015. the experiment was carried –out by using R.C.B.D. with in split-split arrangement. The results revealed that un ploughed and un weedy treatments had the lowest means of the dry weight and seeds yield. The results, also revealed a significant increase in the weed density, weed dry weight, seeds yield and its components with the increasing of phosphorus fertilizer from 100 to 300 kg ha-1 in both seasons. It can be concluded, that growing sunflower with was reduced the weed density and its distribution in the field, and this caused to zero weed competition reduction to the crop and consequently increased the seeds yield and its components. However, increased phosphor fertilizer levels raised weeds density, their dry weight and seed yield of sunflower.

The SCREENING OF HERBICIDES FOR EFFECTIVE CONTROL OF WEEDS IN SOYBEAN (Glycine max L.)

2020 ◽  
Vol 27 (2) ◽  
pp. 251-266
Author(s):  
Muhammad Ehsan Safdar ◽  
Muhammad Ather Nadeem ◽  
Abdul Rehman ◽  
Amjed Ali ◽  
Nasir Iqbal ◽  
...  
Keyword(s):  
Seed Yield ◽  
Soybean Seed ◽  
Dry Weight ◽  
Yield Component ◽  
Effective Control ◽  
College Of Agriculture ◽  
Glycine Max L ◽  
Relationship Of ◽  
Moderate Relationship ◽  
100 Seed Weight

Little is known about best herbicidal weed option for weed eradication in soybean in agro-climatic circumstances of Sargodha, Punjab, Pakistan. A two year field study was accomplished at College of Agriculture experimental site Sargodha in spring seasons of 2018 and 2019 to evaluate the efficacy of different herbicides adjacent to major weeds present in soybean. The study consisted of 8 herbicide treatments including two pre-emergence herbicides (pendimethalin at 489.1 g a.i. ha-1, pendimethalin + S-metolachlor at 731.1 g a.i. ha-1) which are applied immediately after sowing and six post-emergence herbicides (oxyfluorfen at 237.1 g a.i. ha-1, metribuzin at 518.7 g a.i. ha-1, quizalofop-p-ethyl at 148.2 g a.i. ha-1, acetochlor at 741 g a.i. ha-1, halosulfuron at 37 g a.i. ha-1and topramezone at 21.5 g a.iha-1) which were used 25 days subsequent to sowing. In contrast to control, all herbicides have shown significant decline in weed density (up to 94%) and dry weight (up to 88%); and caused significant increases in plant height (up to 85%), pod bearing branches (up to 77%), number of pods per plant (up to 83%), 100-seed weight (up to 37%) and seed yield (up to 160%) of soybean. Among herbicides, topramezone at 21.5 g a.i ha-1 gave significantly the highest (1234 and 1272 kg ha-1 in the year 2018 and 2019) seed yield of soybean and HEIs (1.28 and 1.03 in year 2018 and 2019, respectively). However, oxyfluorfen at 237.1 g a.i. ha-1, pendimethalin + S-metolachlor at 731.1 g a.i. ha-1, pendimethalin at 489.1 g a.i. ha-1, quizalofop-p-ethyl at 148.2 g a.i.ha-1 followed it. The regression analysis depicted a significant negative moderate relationship of soybean seed yield with weed dry weight (R2 = 0.7074), and pods per plant (R2 = 0.7012) was proved to be the main yield component responsible for higher yield of soybean.

Response of promising - rainy summer season greengram (Vigna radiata (L) genotypes to phosphorus fertilization

2017 ◽  
Author(s):  
R. L. Rajput ◽  
Beerbal Singh Rajput
Keyword(s):  
Seed Yield ◽  
Vigna Radiata ◽  
Harvest Index ◽  
Field Experiments ◽  
Growth Yield ◽  
Summer Season ◽  
Phosphorus Fertilization ◽  
College Of Agriculture ◽  
Pooled Data ◽  
Phosphorus Levels

Field experiments were conducted at Rajmata Vijayaraje Scindia Krishi Vishwa Vidyalaya College of Agriculture, Gwalior during two kharif and summer seasons of 2009 and 2010 to study the effect of phosphorus levels and genotype on growth, yield and economics of greengram. Two years pooled results showed that the application of 60 Kg P2O5 /ha registered significantly higher yield (11.52 and 8.41 q/h), yield attributing characters, harvest index (33.61 and 27.86) net retreturn and B:C ratio (3.0 and 2.27) as compared to 30 kg P2O5 /ha during both kharif and summer seasons respectively. Among the genotypes on the basis of pooled data, genotype TM 99-50 gave significantly higher seed yield (13 and 9 q/ha kharif and Summer) yield attributing characters harvest index (37.06 and 30.96%) net return (Rs. 33320 and 19820 /ha) and B:C ratio (3.73 and 2.69) as compare to other genotype during both kharif and summer seasons. The second best genotype was TM 98-50 to augment these parameters. The lowest parameters were recorded in case of HUM-1 in kharif and TRAM-1 in summer season.

Effect of barley plant density on wild oat interference, shoot biomass and seed yield under zero tillage

1999 ◽  
Vol 79 (4) ◽  
pp. 655-662 ◽  
Author(s):  
J. T. O'Donovan ◽  
J. C. Newman ◽  
K. N. Harker ◽  
R. E. Blackshaw ◽  
D. W. McAndrew
Keyword(s):  
Seed Yield ◽  
Yield Loss ◽  
Plant Density ◽  
Interactive Effect ◽  
Dry Weight ◽  
Barley Plant ◽  
Wild Oat ◽  
Zero Tillage ◽  
Shoot Dry Weight ◽  
Plant Densities

There has been little research aimed at developing regression models to describe the effects of barley and wild oat plant density on barley yield loss, or wild oat biomass and seed yield. Such models are an important component of integrated weed management systems, and can help determine when weed control with herbicides is economical. Field experiments were conducted over 4 yr at Vegreville, Alberta, to determine the interactive effects of wild oat and barley plant density on barley and wild oat variables in a zero tillage system. A nonlinear regression model in most cases provided good descriptions of barley yield loss, wild oat shoot dry weight, and wild oat seed yield as functions of wild oat and barley plant densities. The interactive effect of wild oat and barley plant density on percentage barley yield loss did not differ significantly (P = 0.05) among years. A pooled regression model describing barley yield loss accounted for 57% of the variation, and provides a means of estimating yield loss due to wild oat in barley grown under zero tillage. Barley yield loss increased as wild oat density increased but the magnitude of the yield loss diminished with increasing barley plant density. Wild oat economic threshold densities varied among years, and were strongly influenced by barley price and expected wild oat-free yield. Economic thresholds were greater at higher barley plant densities. Barley seed weight decreased with increasing barley plant density, and to a lesser extent with increasing wild oat density. The interactive effect of wild oat and barley plant density on wild oat seed yield varied significantly with year, and appeared to be influenced by climatic conditions. The cooler, wetter spring of 1996 favored wild oat seed production (by several orders of magnitude) compared with the relatively warmer and drier spring of 1995. Each year wild oat seed yield and shoot dry weight decreased as barley plant density increased. The results suggest that seeding barley at relatively high rates may reduce the need for wild oat control with herbicides in zero tillage systems. Key words: Zero tillage, wild oat interference, barley seeding rate, nonlinear regression

Effect of Sowing Methods and Sequential Application of Herbicides on Crop Growth, Nodulation, Weed Growth and Economics of Chickpea

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
MANDHATA SINGH ◽  
DEOKARAN . ◽  
J. S. MISHRA ◽  
B. P. BHATT
Keyword(s):  
Seed Yield ◽  
Weed Management ◽  
Dry Weight ◽  
Conventional Tillage ◽  
Reduced Tillage ◽  
Cost Ratio ◽  
Weed Density ◽  
Benefit Cost Ratio ◽  
Weed Control Efficiency ◽  
Benefit Cost

Chickpea is highly sensitive crop to weed competition as early stage of growth. A field experiment was conducted during winter season of 2013-14 to 2015-16to know the response of application of sequential application of herbicides under different sowing methods. Results revealed that chickpea sowing in reduced tillage performed better and produced higher number of pods per plant, seed yield and protein yield over conventional tillage. In weed management treatment, sequential application of [email protected] kg a.i./ha pre-em followed by imezethapyr @40 g a.i./ha post-em improve the crop growth and produced higher seed yield (1515 kg/ha) and protein yield. Total weed density and weed dry weight were recorded minimum under reduced tillage at both 30 and 60 days after sowing. Application of pendimethalin @0.75 kg a.i./ha pre-emfollowed by imezethapyr @40 g a.i./ha post-em reduced the total weed density and weed dry weight over other treatments and recorded minimum. Weed control efficiency recorded higher with conventional tillage (70.04%) and closely followed by reduced tillage (70.81%). [email protected] a.i./ha pre-emfbimazethapyr @ 40 g a.i./ha recorded highest weed control efficiency (92.93%) followed by pendimethalin 0.75 kg a.i./ha fbquizalofop ethyl 50 g a.i./ha (85.41%) and pendimethalin 1.0 kg a.i./ha (73.78). Net return of Rs 42265and benefit cost ratio of 1.55 were also recorded higher under reduced tillage. Among weed management pendimethalin1.0 kg a.i./ha pre-em followed by imezethapyr @50 g a/i/ha post-em recorded higher net return (Rs 48782) and benefit cost ratio (1.81).

Effect of Crop Species, Tillage, and Rye (Secale cereale) Mulch on Sicklepod (Senna obtusifolia)

Weed Science ◽  
1996 ◽  
Vol 44 (1) ◽  
pp. 133-136 ◽  
Author(s):  
Barry J. Brecke ◽  
Donn G. Shilling
Keyword(s):  
Seed Yield ◽  
Secale Cereale ◽  
Fold Increase ◽  
Field Studies ◽  
Shoot Biomass ◽  
Weed Competition ◽  
No Tillage ◽  
Crop Species ◽  
Weed Growth ◽  
Whole Plant

Field studies were conducted to determine the effect of crop species, tillage, and rye mulch on sicklepod growth. Competition from soybean and sunflower reduced sicklepod biomass by 19 and 77%, respectively. Sicklepod height was reduced by rye mulch. Rye root residue caused 49% reduction in sicklepod biomass, while whole plant rye mulch reduced weed growth an additional 12%. Crop competition reduced sicklepod shoot biomass to a greater extent when rye residue was present. Crop seed yield was 32% lower in tilled plots compared with no-tillage due to more weed competition in the tilled plots. In the presence of rye root residue, soybean yield showed a two-fold increase over no mulch or whole plant rye mulch. Sunflower yield increased by 30% in the presence of rye residue compared with no mulch.

The influence of seeding rate on weed control in small-red lentil (Lens culinaris)

Weed Science ◽  
1997 ◽  
Vol 45 (2) ◽  
pp. 296-300 ◽  
Author(s):  
Daniel A. Ball ◽  
Alex G. Ogg ◽  
Peggy M. Chevalier
Keyword(s):  
Weed Control ◽  
Pacific Northwest ◽  
Seed Yield ◽  
Dry Weight ◽  
Suppressive Effect ◽  
Weed Species ◽  
Seeding Rate ◽  
Partial Control ◽  
Weed Density ◽  
Herbicide Treatments

Experiments were conducted at two sites for 2 yr in the Pacific Northwest dryland cropping region to determine if seeding rate of small-red lentil could enhance weed control with herbicides and increase lentil seed yield. At Pendleton, OR, and LaCrosse, WA, lentil was planted at 22 or 44 kg ha−1 in one direction in all plots. In one-half of the plots, lentil was cross-seeded at right angles with an additional 22 kg ha−1 to provide seeding rates of 22, 44, 22 + 22, and 44 + 22 kg ha−1. Seeding rate main plots were split into three herbicide treatments and an untreated control. Total weed density was reduced by increasing seeding rate at Pendleton both years when averaged over all herbicide treatments. Seeding rate reduced total weed density to a greater extent when herbicides did not adequately control weeds or when herbicides were not applied at Pendleton in 1992. Increased seeding rate also reduced total weed dry weight at Pendleton in 1992 and 1993 and at LaCrosse in 1993. The suppressive effect of increased seeding rate on weed dry weight was more evident when herbicides were not used or when herbicides gave only partial control. Herbicides generally reduced weed density, but the effectiveness of individual treatments was related to the weed species present and environmental conditions present in each experiment. Lentil aboveground dry weight production increased with seeding rate at both locations; however, only in 1 yr did lentil seed yield increase with seeding rate. The primary benefit from increased seeding rate in this study was to reduce weed density and dry weight.

Effects of weed competition on flag leaf photosynthesis and grain yield of spring wheat

1999 ◽  
Vol 132 (1) ◽  
pp. 23-30 ◽  
Author(s):  
J. IQBAL ◽  
D. WRIGHT
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Nitrogen Uptake ◽  
Competitive Ability ◽  
Stomatal Density ◽  
Flag Leaf ◽  
Dry Weight ◽  
Weed Competition ◽  
Weed Species ◽  
Weed Density

Three pot experiments were performed at the University of Wales, Bangor, Gwynedd, UK during 1993 to determine if differences in the competitive ability of three annual weeds (Chenopodium album L., Sinapis arvensis L. and Phalaris minor Retz.) were related to their relative effects on leaf growth, gas exchange and nitrogen uptake of spring wheat (cv. Alexandria). In all experiments, wheat density (316 plants m−2) was similar to that in a commercial crop and five weed density treatments (between 0 and 600 plants m−2) were tested. Measurements of gas exchange were made on fully expanded, attached wheat flag leaves on four occasions between emergence and complete senescence in the control and highest weed density treatments. High weed density resulted in a lowering of net photosynthetic rate due to stomatal and non-stomatal factors. Lamina area and stomatal density of wheat flag leaves were decreased, and specific leaf area was increased by weed competition, but the effects on these variables were smaller than on net photosynthesis. Weed density did not affect wheat plant height, but dry weight, grain yield and total N-uptake were decreased with an increase in density of all weed species. The rank order of competitive ability of the species (C. album>P. minor>S. arvensis) was unaffected by weed density and was the same irrespective of whether it was based on the % decreases in wheat grain yield or in total plant dry weight. Averaged over the four measurements made during the grain-filling period there were only small differences between the weed species in their effects on net photosynthetic rate. However, when these were combined with effects on flag leaf area, there were larger differences in calculated net photosynthetic productivity, which were related to differences in the effects of weeds on grain yield. Differences in the competitive ability of weeds were not related to differences in their effects on wheat flag leaf lamina area, specific leaf area, stomatal density or total nitrogen uptake. Differences in competitive ability between weed species were not related to differences in weed plant height, dry weight or nitrogen uptake. It was concluded that the observed effects of weeds on wheat were due either to shading, or to competition for a nutrient other than nitrogen.

scholarly journals Weed interference on nutrient accumulation in the leaves of cassava under no-tillage or conventional tillage

2020 ◽  
Vol 55 ◽  
Author(s):  
João Ricardo Pompermaier Ramella ◽  
Jaqueline de Araújo Barbosa ◽  
Silvio Douglas Ferreira ◽  
Emerson Fey ◽  
Neumarcio Vilanova da Costa
Keyword(s):  
Dry Matter ◽  
Block Design ◽  
Dry Weight ◽  
Conventional Tillage ◽  
Weed Competition ◽  
No Tillage ◽  
Nitrogen And Phosphorus ◽  
Tillage Systems ◽  
Weed Interference ◽  
Randomized Complete Block Design

Abstract: The objective of this work was to evaluate the effect of weed competition on the accumulation of nitrogen and phosphorus in the leaves and on the dry weight of the roots of cassava (Manihot esculenta) in the conventional and no-tillage systems, in two crop cycles. The experiments were carried out in a randomized complete block design, with split-split plots and four replicates. The plots consisted of conventional tillage or no-tillage; the split plots, of the competition or not with weeds; and the split-split plots, of the evaluation periods (0, 25, 50, 75, 100, 125, 150, 175, 200, and 225 days after planting/pruning). In the first cycle, weed competition reduced the accumulation of nitrogen in 82.6 and 81.3% and of phosphorus in 65.7 and 85.3% under conventional tillage and no-tillage, respectively. In the second cycle, the reductions in the accumulation of nitrogen were of 41.1 and 52.4% and of phosphorus of 44.1 and 52.6%, in conventional tillage and no-tillage, respectively. The root dry weight of cassava grown with weed competition showed reductions of 15.8 and 11.2% under conventional tillage and no-tillage, respectively, only in the second cycle. Weed competition reduces the accumulation of nitrogen and phosphorus in the leaves of cassava in the conventional and no-tillage systems in both crop cycles, but reduces the dry matter of cassava roots only in the second cycle.

scholarly journals Effect of Phosphorus Fertilization on the Growth, Photosynthesis, Nitrogen Fixation, Mineral Accumulation, Seed Yield, and Seed Quality of a Soybean Low-Phytate Line

Plants ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 119 ◽  
Author(s):  
Nisar Ahmad Taliman ◽  
Qin Dong ◽  
Kohei Echigo ◽  
Victor Raboy ◽  
Hirofumi Saneoka
Keyword(s):  
Nitrogen Fixation ◽  
Seed Yield ◽  
Seed Quality ◽  
Dry Weight ◽  
Molar Ratio ◽  
Phosphorus Fertilization ◽  
Leaf Photosynthesis ◽  
P Fertilization ◽  
P Concentration ◽  
P Application

Crop seed phosphorus (P) is primarily stored in the form of phytate, which is generally indigestible by monogastric animals. Low-phytate soybean lines have been developed to solve various problems related to seed phytate. There is little information available on the effects of P fertilization on productivity, physiological characteristics, and seed yield and quality in low-phytate soybeans. To address this knowledge gap, studies were conducted with a low-phytate line and two normal-phytate cultivars from western Japan when grown under high- and low-P fertilization. The whole plant dry weight, leaf photosynthesis, dinitrogen fixation, and nodule dry weight at the flowering stage were higher in the higher P application level, but were not different between the low-phytate line and normal-phytate cultivars. As expected, seed yield was higher in the higher level of P application for all lines. Notably, it was higher in the low-phytate line as compared with the normal-phytate cultivars at both levels of fertilizer P. The total P concentration in the seeds of the low-phytate line was the same as that of the normal-phytate cultivars, but the phytate P concentration in the low-phytate line was about 50% less than that of the normal-phytate cultivars. As a result the molar ratio of phytic acid to Zn, Fe, Mn, and Cu in seed were also significantly lower in the low-phytate line. From these results, it can be concluded that growth after germination, leaf photosynthesis, nitrogen fixation, yield and seed quality were not less in the low-phytate soybean line as compared with two unrelated normal-phytate cultivars currently grown in Japan, and that low-phytate soybeans may improve the bioavailability of microelements.

Evaluation of different herbicides against weeds in mungbean (Vigna radiata L.)

2019 ◽  
Author(s):  
Lata Verma ◽  
H. S. Kushwaha
Keyword(s):  
Weed Control ◽  
Seed Yield ◽  
Dry Weight ◽  
Yield Attributes ◽  
Weed Density ◽  
Net Returns ◽  
Weed Control Efficiency ◽  
Stover Yield ◽  
Hand Weeding ◽  
Clodinafop Propargyl

A field experiment was conducted during kharif season of 2016 at Mahatma Gandhi Chitrakoot Gramodaya Vishwavidyalaya, Chitrakoot, Satna (M.P.) to study the efficacy of different herbicides against weeds in mungbean. The weed density recorded at 30 and 60 DAS was significantly lower under pendimethalin 30 EC + imazethapyr 2 EC (Ready mix) 0.75 kg/ha as pre-emergence (PE) followed by pendimethalin PE. However, significantly lower weed dry weight and statistically superior weed control efficiency were noted in twice hand weeding at 20 DAS and 40 DAS and pendimethalin + imazethapyr (R.mix.) 0.75 kg/ha at same stages of crop (30 and 60 DAS). While, yield attributes viz. pods/plant (21.8) was significantly higher in plot treated with imazethapyr 10 SL @ 40g/ha applied at 20 DAS and statistically at par with imazamox 35 WG+ imazethapyr 35 WG 60g/ha applied at 20 DAS and clodinafop - propargyl 8% + aciflourfen - sodium 16.5% (WP) 187.5 kg/ha applied at 20 DAS. Application of clodinafop - propargyl 8% + aciflourfen - sodium 16.5% (WP) 187.5 kg/ha at 20 DAS produced significantly maximum seed yield (531 kg/ha) of mungbean closely followed by imazethapyr 10 SL @ 40g/ha at (528 kg/ha) and pendimethalin 30 EC + imazethapyr 2 EC (R.mix) 0.75 kg/ha (521 kg/ha). However, stover yield (2699 kg/ha), gross returns (`58464/ha) and net returns (`43163/ha) were obtained significantly superior under clodinafop - propargyl 8% + aciflourfen - sodium 16.5% (WP) 187.5 g/ha.

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