Yield and quality response of soybean to full and deficit irrigation at different growth stages under sub-humid climatic conditions

A field experiment was conducted to evaluate the yield and quality parameters of oats (Avena sativa L.) at forage research farm in Punjab Agricultural University, Ludhiana. Four different nitrogen levels viz. 0 (control), 50, 75 (recommended) and 100 Kg N/ha were applied in the form of urea. Samples were collected at three different growth stages i.e. 30, 45 and 60 DAS. As the growth of plant continued decrease in total nitrogen (45%), non protein nitro-gen (37%), ether extract (13%), ash content (24%) and digestibility (23%) was observed. But increase in free amino acids (48%) and cell wall constituents i.e. ADF (19%), NDF (31%) and CF (34%)with plant’s growth was reported. The interactive effect of varying levels of inorganic fertilizer application on the chemical composition of the plant at various growth stages revealed an increase in total nitrogen (18%), non protein nitrogen (26%), ether extract (18%), free amino acids (32%), ash content (13%) and digestibility (7%) with increase in fertilizer level however ADF (7%), NDF (2%) and CF (3%)content decreased with increased levels of nitrogen fertilization. Correlation studies showed that significant negative correlation was present forin vitro dry matter digestibility with acid detergent fiber (r= -.861**), neutral detergent fiber (r= -.891**) and crude fiber (r= -.740**) at recommended dose of N fertilization. The objective of this study was to investigate the effect of different doses of nitrogen fertilization at different growth stages on quality components in oats fodder.

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A field study of Bactericera cockerelli feeding timing in potato crops

New Zealand Plant Protection ◽

10.30843/nzpp.2017.70.84 ◽

2017 ◽

Vol 70 ◽

pp. 320

Author(s):

J.N. Furlong ◽

J. Vereijssen ◽

A.R. Pitman ◽

R.C. Butler

Keyword(s):

Growth Stages ◽

Insect Vector ◽

Bactericera Cockerelli ◽

Zebra Chip ◽

Growing Seasons ◽

Yield And Quality ◽

Zebra Chip Disease ◽

Candidatus Liberibacter ◽

Potato Crops ◽

Different Growth Stages

Since its 2006 detection in New Zealand, the tomato potato psyllid (TPP), Bactericera cockerelli, has been responsible for yield and quality-reducing damage to potatoes as well as to other solanaceous crops. TPP is best known as the insect vector for the zebra chip disease-associated bacterium Candidatus Liberibacter solanacearum (CLso), but feeding by CLso-negative TPP on potatoes is also linked to damaging effects. An improved understanding of which potato plant physiological stages are most affected by feeding of CLso-negative TPP will allow for more directed integrated pest management (IPM) plans. As part of a two-year repeated eld study to assess the effect of TPP feeding timing on potatoes, CLso-negative TPP were released into mesh cages over outdoor potato (‘Moonlight’) plantings at ve different growth stages: post-emergence, owering, post- owering, late-season, and pre-harvest. Tubers were grouped by plant at harvest. (Un)marketable numbers and weights, marketable dry matter and zebra chip severity were determined. Results from this trial and other shadehouse trials conducted previously are still being analysed but have the potential to better target IPM plans and reduce costly, labour-intensive, and environmentally impactful pesticide spray use, which is currently relied on heavily throughout growing seasons.

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Crop Weather Relationships of Fodder Sorghum Varieties under Different Sowing Times in Southern Agro Climatic Zone of Andhra Pradesh

Journal of Applied Life Sciences International ◽

10.9734/jalsi/2020/v23i530162 ◽

2020 ◽

pp. 20-28

Author(s):

K. Saimaheswari ◽

T. Prathima ◽

D. Subramanyam ◽

P. Latha

Keyword(s):

Andhra Pradesh ◽

Climatic Conditions ◽

Day Length ◽

Growth Stages ◽

Sowing Time ◽

Agricultural College ◽

Sunshine Hours ◽

Increasing Trend ◽

Relationship Of ◽

Different Growth Stages

Field experiment was carried out during summer, 2018 at S. V. Agricultural College, Tirupati, Acharya N. G. Ranga Agricultural University to study the crop weather relationship of fodder sorghum varieties under different times of sowing. The experiment was in four dates of sowing (I Fortnight of January, II Fortnight of January, I Fortnight of February and II Fortnight of February) with varieties (CSV 21 F, CSV 30 F and CSV 32 F). Results are revealed that among the four times of sowing, different meteorological indices GDD, HTU, PTU, and TUE varied across the different growth stages. Early sowing (I Fortnight of January) had favorable agro-climatic conditions particularly temperature, day length and sunshine hours interms of required accumulation of GDD, PTU and HTU from sowing to harvest compared to other dates of sowing. Total requirement of accumulated GDD, HTU and PTU showed increasing trend with extension of sowing time from I Fortnight of January to II Fortnight of February. The CSV 32 F variety accumulated maximum GDD from sowing to until harvest.

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Effects of Deficit Irrigation on Yield and Quality of Onion Crop

Journal of Agricultural Science ◽

10.5539/jas.v8n3p112 ◽

2016 ◽

Vol 8 (3) ◽

pp. 112 ◽

Cited By ~ 4

Author(s):

David K. Rop ◽

Emmanuel C. Kipkorir ◽

John K. Taragon

Keyword(s):

Water Stress ◽

Water Use ◽

Irrigation Water ◽

Deficit Irrigation ◽

Water Productivity ◽

Growth Stages ◽

Irrigation Water Use Efficiency ◽

Yield And Quality ◽

Irrigation Water Use ◽

Use Efficiency

<p>The broad objective of this study was to test Deficit Irrigation (DI) as an appropriate irrigation management strategy to improve crop water productivity and give optimum onion crop yield. A field trial was conducted with drip irrigation system of six irrigation treatments replicated three times in a randomized complete block design. The crop was subjected to six water stress levels 100% ETc (T100), 90% ETc (T90), 80% ETc (T80), 70% ETc (T70), 60% ETc (T60) and 50% ETc (T50) at vegetative and late season growth stages. The onion yield and quality based on physical characteristics and irrigation water use efficiency were determined. The results indicated that the variation in yield ranged from 34.4 ton/ha to 18.9 ton/ha and the bulb size ranged from 64 mm to 35 mm in diameter for T100 and T50 respectively. Irrigation water use efficiency values decreased with increasing water application level with the highest of 16.2 kg/ha/mm at T50, and the lowest being13.1 kg/ha/mm at T100. It was concluded that DI at vegetative and late growth stages influence yields in a positive linear trend with increasing quantity of irrigation water and decreasing water stress reaching optimum yield of 32.0 ton/ha at 20% water stress (T80) thereby saving 10.7% irrigation water. Onion bulb production at this level optimizes water productivity without significantly affecting yields. DI influenced the size and size distribution of fresh onion bulbs, with low size variation of the fresh bulbs at T80.</p>

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