Search or add a thesis

Advanced Search (Beta)
Home > Impact of Polyamines and Nitrogen Application on the Water Economy of Hybrid Maize Zea Mays L.

Impact of Polyamines and Nitrogen Application on the Water Economy of Hybrid Maize Zea Mays L.

Thesis Info

Access Option

External Link

Author

Hussain, Shabir

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2013

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1009

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726422605

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Water deficit is one of the major limitations in harvesting potential crop yields. Exogenous application of polyamines and crop nutrition may help in improving the crop productivity under water limited conditions. During this study, consisted of three pot and two field experiments, the role of polyamines and nitrogen application for improving the maize performance under different soil moisture regimes was investigated. In first pot experiment, maize hybrids Pioneer 30-Y-87, Pioneer 31-R-88, Pioneer 32-W-86, Pioneer 3025 and Pioneer 3062 were grown in plastic pots maintained at 80, 60, 40 and 20% water holding capacity (WHC) for screening against drought. Performance of maize hybrid Pioneer 31-R-88 was better (in terms of seedling biomass, leaf area and leaf water status), so was selected as drought resistant; whereas, performance of Pioneer 30-Y-87 was poor and was designated as drought sensitive. In second and third pot experiments, conducted for optimizing the levels and methods of polyamines application, 0.1, 0.01 and 0.001 mM polyamines (putrescine, spermidine and spermine) were exogenously applied as seed treatment and were foliar sprayed on maize hybrids Pioneer 31-R-88 (drought resistant) and Pioneer 30-Y-87 (drought sensitive) sown at 80 and 40% soil WHC. Although application of all polyamines, both as seed treatment and foliar spray, at all rates substantially improved the seedlings vigor, leaf area and leaf water status at both soil moisture regimes in both the tested hybrids; however, application at 0.1mM of all polyamines was more effective. In two years field experiments, two maize hybrids Pioneer 31-R-88 and Pioneer 30-Y-87 were grown at three moisture regimes viz. -15, -30 and -45 kPa. In first field experiment, 0.1 mM each of putrescine, spermidine and spermine were foliage applied. In second field experiment, nitrogen was applied as basal dose, half as basal dose +half at knee height, half as basal dose + half at tasseling, half at knee height +half at tasseling and one third as basal dose + one third at knee height +one third at tasseling. Foliage application of 0.1 mM putrescine was the most effective and economical to improve the maize productivity under normal and water deficit conditions. Nitrogen application in three splits (one third as basal dose + one third at knee height +one third at tasseling) was the most effective and economical to harvest good maize crop. In crux, application of 0.1mM putrescine and nitrogen in three splits improved the productivity and water economy of hybrid maize in water-limited environments.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

دل کی بات نہیں سنتا ہے

دل کی بات نہیں سنتا ہے

میں نے کہا اجازت ہو تو
دل کی بات کہوں اک تم سے
اُس نے کہا نہیں رہنے دو

Efforts to Improve the Creative Economy During the Covid-19 Pandemic in Asean Countries

Increasing the creative economy during the pandemic is very urgent, as an effort to stabilize the economy in ASEAN. The character of the creative economy is characterized by economic activities that are based on the exploration and exploitation of creative ideas that have high selling value. All tourism ministers from ASEAN countries to strengthen tourism cooperation, one of the economic sectors hardest hit in the pandemic. Intelligent marketing is needed in order to know the strengths of our competitors and market tastes, because in the era of globalization, war is actually a war in the economic field and the creative economy is the main weapon. Strong cooperation in efforts to jointly handle the impact of COVID-19 in the tourism sector in the ASEAN region. All ASEAN members to jointly enhance cooperation not only in dealing with pandemic problems but also in terms of developing the creative economy.

Daily Stressors, Coping Strategies and Adjustment of Adolescents

This study was initiated to identify the daily stressors, coping strategies and adjustment of adolescents. It was a two phased study. In Phase I, a pilot study was conducted on thirty two adolescents who were between 14 to 18 years of age, to establish the applicability of the instruments to be used for the final study and also to have a preliminary sense of the qualitative and quantitative aspects of the research. In Phase II, two studies were conducted. In Study A, Situational COPE (Carver & Scheier, 1982), was used to identify daily stressors and coping strategies. Perceived Self Efficacy Scale (Jerusalem & Schwarzer, 1979) was used as an indicator of adjustment. 435 (249 females, 186 males) school/college students participated in this study. Their age ranged between 14 and 19 years (M= 16.84). Content analysis of reported stressors revealed four major stressful domains: Academics, Interpersonal, Intra personal and Socio-environmental. Religious Coping, Planning, Positive Reinterpretation and Growth, Focus on and Venting of Emotions emerged as the most dominant coping strategies. The less opted strategies were Substance Use and Humor. Problem-Focused coping dominated over Emotion-Focused or Dysfunctional coping types. Frequency of stressors demonstrates that females were more stressed in the domains of academics and interpersonal relations and males were more stressed in socio-environmental domain. Intrapersonal stressors were reported equally by both genders. Likewise, intrapersonal stressors were less in early adolescents and high in mid adolescents; interpersonal stressors were reported equally by all age groups. Similarly, academic stressors were more pronounced in early adolescents and less in older adolescents; socio-environmental stressors, however, increased with age. Analysis of variance (ANOVA) was conducted, to see the main effects of gender on different COPE scales. Significant gender differences were found on four sub-scales: Religious Coping [F(1,434)= 3.86, p< .05], Humor [F(1,434)= 6.45, p= .05], Behavior Disengagement [F(1,434)= 5.95, p< .05], and Substance Use [F(1,434)= 4.49, p< .05]. Females scored high on Religious Coping and Behavioral Disengagement and males scored high on Humor and Substance Use. ANOVA was also computed to see age effects and significant differences were found on three COPE sub-scales. On Focus on and Venting of Emotions, adolescents in their mid years vented off their emotions more [F(2,434)= 3.35, p< .05], Denial [F(2,434)=3.45, p< .05] was more among older adolescents and Acceptance [F(2,434)= 4.34, p< .05] increased with age. The perceived Self-efficacy among adolescents was also high and it was positively correlated with Problem-focused coping. In Study B, thirty participants (15 males, 15 females), 17 to 19 years of age were studied repeatedly for six weeks. Initially Dispositional COPE (Carver & Scheier, 1982) was given to them to see their usual coping pattern. Then, diary method was used to identify their daily stressors and Situational COPE was used to assess coping. A qualitative analysis was carried out, individual patterns emerged and each pattern did not match largely with the reported dispositional style coping of those individuals, hence preference for certain coping strategies did emerge. Gender comparison was also done and both males and females exhibited coping with stressful situations in a variety of ways. Active coping, Planning, Acceptance, Religious Coping, Mental or Behavioral Disengagement, Focus on and Venting of Emotions were the most dominant coping strategies for stressors related to academics, interpersonal, intrapersonal and socio-environmental domains.