Crop Coefficient-based Deficit Irrigation and Planting Density for Onion: Growth, Yield, and Bulb Quality

Leskovar, Daniel I.; Agehara, Shinsuke; Yoo, Kisoo; Pascual-Seva, N.

doi:10.21273/hortsci.47.1.31

Cited by 35 publications

(44 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Generally, spinach plants require sufficient amount of water for optimum growth, but if they experience water deficit conditions, a considerable restraint to its production takes place (Xu & Leskovar 2015). A remarkable reduction in the yield of spinach plants was also reported in some earlier studies under water deficit conditions; particularly 50% irrigation showed a marked suppression in crop yield (Leskovar et al 2012). Xu and Leskovar (2015) reported that water stress suppressed the growth, leaf area, relative water contents and gas exchange attributes of spinach plants, while application of a seaweed extract was found to be beneficial for improving the growth, leaf water relations and gas exchange attributes.…”

Section: Introductionmentioning

confidence: 64%

Assessment of Biochemical Changes in Spinach (Spinacea oleracea L.) Subjected to Varying Water Regimes

Jabeen¹,

Akram²,

Ashraf³

et al. 2019

JSM

View full text Add to dashboard Cite

It is known that leafy vegetables including spinach (Spinacea oleracea L.) contain relatively high amount of water, therefore, their water requirement during the life cycle is comparatively more than the other vegetables. In addition, there is an association between osmoprotection and antioxidants with reference to drought stress tolerance. Keeping in mind these facts, the present study was conducted to assess the changes in plant growth, osmoprotectants, chlorophyll pigments and activities/levels of antioxidative system in spinach (Spinacea oleracea L.) grown under varying water deficit regimes with 40%, 60%, 80% and 100% field capacity (FC). Imposition of varying water regimes significantly decreased shoot and root fresh and dry weights, shoot plus root lengths, and chlorophyll b contents of spinach plants. Increase in proline, glycinebetaine (GB), total phenolics, ascorbic acid and malondialdehyde (MDA) contents as well as the activities of antioxidant enzymes including superoxide dismutase, peroxidase and catalase were observed in the spinach plants particularly at 40% FC. The most effective level of water stress for elevating the proline, GB and antioxidant levels/ activities was observed at 40% FC followed by 60% FC. Hence, the results of this study suggested that upregulation of antioxidants and osmoprotectants is positively associated with the drought tolerance of spinach which depends on the severity of water stress level. These results can be used to narrow the gap between selection of plant species and requirement of irrigated water for the crops grown on dry land areas. ABSTRAKAdalah diketahui bahawa sayur-sayuran berdaun termasuk bayam (Spinacea oleracea L.) mengandungi jumlah air yang agak tinggi, oleh itu, mereka memerlukan lebih air sepanjang kitaran hidup berbanding sayur-sayuran lain. Di samping itu, terdapat hubungan antara osmoperlindungan dan antioksidan berkaitan toleransi tekanan kemarau. Dengan mengambil kira fakta tersebut, kajian ini dijalankan untuk menilai perubahan dalam pertumbuhan tanaman, osmoperlindungan, pigmen klorofil serta aktiviti/tahap sistem antioksidatif pada bayam (Spinacea oleracea L.) yang ditanam di bawah rejim defisit air berbeza dengan 40%, 60%, 80% dan 100% kapasiti lapangan (FC). Pengenaan rejim air yang berbeza dengan ketara mengurangkan berat segar dan kering pucuk dan akar, panjang pucuk dan akar serta kandungan klorofil b pada pokok bayam. Pertambahan kandungan prolin, glisinbetain (GB), jumlah fenolik, asid askorbik dan malondialdehid (MDA) serta aktiviti enzim antioksida termasuk superoksida dismutase, peroksidase dan katalase telah diperhatikan pada tanaman bayam terutamanya pada 40% FC. Tahap tekanan air paling berkesan untuk meningkatkan tahap/aktiviti proline, GB dan antioksidan diperhatikan pada 40% FC diikuti 60% FC. Oleh itu, keputusan kajian ini mencadangkan pengawalaturan atas antioksidan dan osmoperlindungan dikaitkan secara positif dengan toleransi kemarau oleh bayam yang bergantung pada keterukan aras tekanan air. Keputusan ini boleh digunakan unt...

show abstract

Section: Introductionmentioning

confidence: 64%

Assessment of Biochemical Changes in Spinach (Spinacea oleracea L.) Subjected to Varying Water Regimes

Jabeen¹,

Akram²,

Ashraf³

et al. 2019

JSM

View full text Add to dashboard Cite

show abstract

“…Factors related to cultivation that can easily be modified, such as the harvest age and population density, promote changes in plants, both in morphology and postharvest quality attributes (Andrade et al, 2017;Leskovar, Agehara, Yoo, & Pascual-Seva, 2012;Simões et al, 2010). Recently, some field strategies have been reported to delay PPD in unprocessed cassava roots (Zainuddin et al, 2018).…”

mentioning

confidence: 99%

Association of preharvest management with oxidative protection and enzymatic browning in minimally processed cassava

et al. 2019

View full text Add to dashboard Cite

The aim of this study was to examine oxidative protection and enzymatic browning in the storage of minimally processed cassava and their relationship with population density and harvest age. Population densities were 1.0, 1.25, 1.5, and 1.75 plants m−2. After being harvested at 300, 360, or 420 days after planting, cassava were minimally processed and stored at 5 ± 2°C. It was observed that superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) play key roles in the tolerance of young roots to browning. Planting density, however, does not appear to be a key factor modulating the activity of the enzymes studied. Practical applications Younger harvested cassava roots, harvested at 300 days, are more tolerant to enzymatic browning. This appears to be in part due to enzymatic activity modulation of the SOD, CAT, and POD enzymes. In addition, it has been demonstrated that agronomic techniques aimed at increasing productivity, such as increasing the planting density of cassava, do not alter the biomarkers of postharvest quality. In summary, evidence that field management may be an efficient approach to improving the conservation of minimally processed cassava is provided. We believe that the findings of this paper will be of great interest regarding the influence of field management on the postharvest quality of freshly cut cassava and will also provide applicable results relating to its production chain.

show abstract

“…During early development, onions seedlings are highly susceptible to soil-borne diseases, extreme temperatures, and weeds, often reducing plant stands (Leskovar et al, 2004a). To compensate for these losses in plant population, growers typically increase the seeding density (Leskovar et al, 2012).…”

mentioning

confidence: 99%

Containerized Onion Transplants: A Management System to Enhance Growth, Yield, and Quality

Macias-Leon¹,

Leskovar²

2019

horts

Self Cite

View full text Add to dashboard Cite

In the United States, most short-day onions are direct seeded. With this method, plant stands can be reduced because of extreme temperatures, weed pressure, and soilborne diseases. Containerized transplants offer an alternative method of stand establishment with less seedling losses while producing uniform bulb sizes and high marketable yield. However, the use of transplants is not a widespread commercial practice because of the high cost of production. This study aims to select the best transplant strategies to improve onion crop performance in semiarid regions of southwest Texas or similar environments. Three sequential transplanting dates of early, mid, and late season (14 Nov., 8 Dec., and 9 Jan.) and two seedling densities of one seed per cell (T1) and three seeds per cell (T3) were evaluated on growth, yield, bulb quality, and phytonutrient content of three onion cultivars, two yellow ('Caramelo' and 'Don Victor'), and one red ('Lambada'). During early development, late-transplanted onions had an increase in plant height and greater leaf elongation rate than early and midtransplanted onions, whereas early plantings required more days to reach maturity than mid and late plantings. Overall, early and midtransplanting dates resulted in higher yields than late plantings. Although increasing seedling density (T3 vs. T1) did not significantly reduce marketable yield in early plantings, T1 produced a higher number of jumbo and colossal bulb sizes than T3. Onion quality was mostly affected by cultivar and not by transplant strategies. The technique of establishing onions from transplants grown from one plant per cell (T1) or multiple plants (T3) from early November to early December provides a practical and economical alternative to achieve earlier crops, while reducing the length of the production season, as planting date is delayed.

show abstract

Crop Coefficient-based Deficit Irrigation and Planting Density for Onion: Growth, Yield, and Bulb Quality

Cited by 35 publications

References 30 publications

Assessment of Biochemical Changes in Spinach (Spinacea oleracea L.) Subjected to Varying Water Regimes

Assessment of Biochemical Changes in Spinach (Spinacea oleracea L.) Subjected to Varying Water Regimes

Association of preharvest management with oxidative protection and enzymatic browning in minimally processed cassava

Containerized Onion Transplants: A Management System to Enhance Growth, Yield, and Quality

Contact Info

Product

Resources

About