Seed nitrogen and fatty acids reflecting yield variation in groundnut (Arachis hypogaea)

This article does not have an abstract

Radiowave fading at Waltair during I.G.Y

This article does not have an abstract

Climate change adaptation and mitigation strategies for sustainable crop production

Climate change is the main environmental problem facing humanity. Evidences over the past few decades show that significant changes in climate are taking place all over the world as a result of enhanced human activities through deforestation emission of various greenhouse gases and indiscriminate use of fossil fuels. Carbon dioxide (CO2) Methane and Nitrous Oxide are the major greenhouse gases. CO2 enters the atmosphere mostly through burning fossil fuels. Methane emissions also result from livestock and other agricultural practices and Nitrous Oxide is emitted during agricultural and industrial activities. Global atmospheric concentration of CO2 has increased from pre-industrial level of 280 parts per million (ppm) to 408 ppm in Feb 2018. Global projections indicate higher temperature of 1.5 to 4.5°C by the year 2050 as a result of enhanced greenhouse gases. There is medium confidence in that the Indian summer monsoon circulation weakens but this is compensated by increased atmospheric moisture content leading to more rainfall. There is medium confidence in an increase of Indian summer monsoon rainfall and its extremes throughout the 21st century under all RCP (Representative Concentration Pathways) scenarios

Genotype dependent response to Azospirillum treatment in yield and nitrogenase activity in Brassica juncea L.

Twelve advanced lines of mustard (Brassica juncea L.) were evaluated for response to treatment with Azospirillum brasilense in yield and a few components. Two lines gave yield increases with concomitant increases in nitrogenase activity and Azospirillum population. In general, there were desirable and significant correlations between plot yield, nitrogenase activity and log, (Azospirillum population). The results point to the possibility of utilizing genotype-dependent response to Azospirillum in breeding programmes and also for exploring new avenues of Azospirillum-based cultural practices in sustaining improved productivity

Ideotype and relationship between morpho-physiological characters and yield in Indian mustard (Brassica juncea)

Twelve genotypes of Indian mustard [Brassica juncea (L.) Czemj. & Cosson] were evaluated for various yield and morpho- physiological characters during 1990 and 1991. The genotypes were classified basal or non-basal branching type on the basis of the presence or absence of at least 1 productive primary branch within 30 cm height of the plant. A correlation analysis revealed that the traits related to basal branching were positively associated among themselves as well as with the seed yield. There were desirable and negative associations of basal branching characters with flowering time and plant height. Thus breeding for early maturing basal branching plant types with medium height and high yield is possible

Combating Drought through Integrated Watershed Management for Sustainable Dryland Agriculture

In a country like India, where 69% of arable land is rainfed, drought is a constant threat in one or another part of country. Drought is a recurring phenomenon and we need to manage drought effectively using the new knowledge and technology rather than dealing with as a disaster. Historical weather data helps in understanding the patterns of drought occurrence as well as establishing the length of the growing season and fItting the suitable cropping systems accordingly. The nexus between drought, land degradation and poverty could be broken by adopting integrated watershed development approach. The ICRISAT and partners developed an innovative farmer participatory consortium model for efficient and sustainable management of natural resources in the watersheds. The approach adopted is integrated genetic and natural resource management (lGNRM) and watersheds are used as entry points for improving the livelihoods. The results of a case study and scaling-up activities under the Andhra Pradesh Rural Livelihoods Program are discussed

Effect of Magnetic Activity on Radiowave Fading

168The effect of magnetic activity on the fading frequency of C W transmissions at oblique incidence recorded at Kakinada has been studied. The results indicate that there is positive correlation at 1800 hrs IST and negative correlation during 1900-2300 hrs IST between magnetic activity and fading frequency at this low latitude station. The result was explained on the basis of positive correlation between spread-F and fading frequency and negative correlation between spread-F occurrence an magnetic activity

Effect of meteor activity on the E-region fading

The effect of meteor activity on the fading of a radiowave reflected from the E-region in the ionosphere was studied during 1957-1958 and 1963-1964 at Waltair (17°43N, 83°18E-Geomag. Lat. 7·4°N). The fading frequency of a radiowave reflected from the E-region was found to increase during meteor shower periods. The annual variation of fading frequency in the E-region was studied in relation to sporadic meteor activity. From a study of the variation of fading frequency and visual hourly meteor rate with time during the Geminid shower of 1963 and Leonid shower of 1964 it was concluded that both fading frequency and meteor rate attain maximum values at about the same time