Seasonal variation of low-latitude E-region plasma irregularities studied using Gadanki radar and ionosonde

In this paper, we present seasonal variation of E region field-aligned irregularities (FAIs) observed using the Gadanki radar and compare them with the seasonal variation of Es observed from a nearby location SHAR. During daytime, FAIs occur maximum in summer and throughout the day, as compared to other seasons. During nighttime, FAIs occur equally in both summer and winter, and relatively less in equinoxes. Seasonal variations of Es (i.e. ftEs and fbEs) show that the daytime activity is maximum in summer and the nighttime activity is maximum in equinoxes. No relation is found between FAIs occurrence/SNR and ftEs/fbEs. FAIs occurrence, however, is found to be related well with (ftEs-fbEs ). This aspect is discussed in the light of the present understanding of the mid-latitude Es-FAIs relationship. The seasonal variations of FAIs observed at Gadanki are compared in detail with those of Piura, which show a significant difference in the daytime observations. The observed difference has been discussed considering the factors governing the generation of FAIs

Early-maturing, large-seeded and high-yielding groundnut varieties ICGV 96466, ICGV 96468 and ICGV 96469.

ICGV 96466, ICGV 96468 and ICGV 96469 are large-seeded, early-maturing and high-yielding groundnut genotypes developed through hybridization at the International Crops Research Institute for the Semi-Arid Tropics in Patancheru, Andhra Pradesh, India, and released in 2004. In yield trials conducted at ICRISAT during the rainy and post-rainy seasons of 1997-2001, ICGV 96466, ICGV 96468 and ICGV 96469 recorded higher yields and 100-seed weights than the control cultivars JL 24 (early-maturing) and Somnath (medium maturing with large seeds)

Groundnut Cultivar Nyanda (ICGV 93437) Released in Zimbabwe

Nyanda (ICGV 93437) is a new Spanish groundnut breeding line developed at the International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India, during the 1990s. It was released in Zimbabwe in 2001 for commercial cultivation. It was derived from the cross between two early maturing advanced breeding lines ICGV 86063 and ICGV 86065. Nyanda produces 13.5% higher yield than the popular cultivar Falcon. It matures 6 days earlier than Falcon and is almost similar to Falcon in shelling outturn and seed size. Nyanda has erect growth habit, sequential branching pattern and green plant colour. Data on various morphological, agronomic and seed quality traits are tabulated

Registration of Early-Maturing, Rust, Late Leaf Spot, and Low Temperature Tolerant Peanut Germplasm Line ICGV 92267

ICGV 92267 (Reg. no. GP-116, PI 630947) is an improved Spanish peanut (Arachis hypogaea L. subsp. fastigiata var. vulgaris Harz) germplasm line, bred at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, India. This germplasm line was released by the Plant Materials Identification Committee of ICRISAT in 2000 for its early-maturity, less susceptibility to rust (caused by Puccinia arachidis Speg.) and late leaf spot [caused by Phaeoisariopsis personata (Berk. & M.A. Curtis) Arx; syn. Cercosporidium personatum (Berk & M.A. Curtis) Deighton], and chill tolerance to low temperature at germination

Registration of Early-Maturing Fresh Seed Dormant Peanut Germplasm ICGV 93470

ICGV 93470 (Reg. no. GP-102, PI 614087) is an improved Spanish peanut (Arachis hypogaea L. subsp. fastigiata var. vulgaris) germplasm, developed at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Center, Patancheru, Andhra Pradesh, India. This improved germplasm was released by the Plant Materials Identification Committee of ICRISAT in 1999 for its early-maturity and fresh seed dormancy in a Spanish background

Registration of Early-Maturing, Moderately Resistant to Rust Peanut Germplasm ICGV 94361

ICGV 94361 (Reg. no. GP-101, PI 614086) is an improved Spanish peanut (Arachis hypogaea L. subsp. fastigiata var. vulgaris) germplasm, developed at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Center, Patancheru, Andhra Pradesh, India. This improved germplasm was released by the Plant Materials Identification Committee of ICRISAT in 1999 for its early maturity and less susceptibility to rust (caused by Puccinia arachidis Speg.) than the popular cultivars in India TMV 2 and JL 24

Latitudinal variation in vertical distribution of meteor decay time and its relation with mesospheric Ozone in the altitude range of 80-90 km

115-124Investigations on meteor trail decay time and its evolution in the mesosphere and lower thermosphere are very important to estimate the temperature in this region. The present study focuses on the vertical distribution of meteor decay times at three different latitudes to understand the mechanism responsible for the deviation of meteor decay time from the theoretical estimations below 90 km of altitude. The present study is based on measurements from three identical meteor radars located at equatorial (Kototabang: 0.2° S, 100.3° E), low (Thumba: 8.5° N, 76.9° E) and polar latitudes (Eureka: 80.0° N, 85.8° W). The results reveal a pronounced seasonal variation of vertical distribution of meteor decay time turning altitude (inflection point) over polar latitudes as compared to that over equatorial and low latitudes. Apart from direct estimations from meteor radar observations, the meteor decay time is estimated using temperature and pressure measurements from the SABER/TIMED. Above 90 km of altitude, decay times estimated from both methods are in good agreement. However, below 90 km of altitude, these estimations start deviating and it has been noted that the deviation increases with decreasing altitude. Further, observed meteor decay times correlated with ozone concentration at three representative altitude bins. The correlation analysis reveals a significant negative correlation at 80 - 90 km of altitude over the three latitudes indicating that an increase in ozone concentration results in decrease in meteor decay time. The significance of the present results lies in analyzing the vertical distribution of meteor decay time simultaneously from three radar locations representing equatorial, low and polar latitudes and evaluating the relation between ozone concentration and meteor decay time, quantitatively

Registration of Aspergillus flavus Seed Infection Resistant Peanut Germplasm ICGV 91278, ICGV 91283, and ICGV 91284

Improved Spanish peanut (Arachis hypogaea L. subsp. fastigiata var. vulgaris) germplasm ICGV 91278 (Reg. no. GP-98, PI 614083), ICGV 91283 (Reg. no. GP-99, PI 614084), and ICGV 91284 (Reg. no. GP-100, PI 614085) were developed at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Center, Patancheru, Andhra Pradesh, India. These lines were released by the Plant Materials Identification Committee of ICRISAT in 1999 for resistance to natural seed infection and invitro seed colonization by the aflatoxin-producing fungus Aspergillus flavus (Link:Fr)

Registration of ICGV 86143 Peanut Germplasm

ICGV 86143, a Spanish peanut (Arachis hypogaea L. subsp.fastigiata Waldron var. vulgaris Harz) germplasm (Reg. no. GP-87, PI 596359) was bred at the Asia Center of the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, India. It was released in 1994 by the Tamil Nadu Agricultural University, Tamil Nadu, India, as BSR 1 for rainfed cultivation in the western zone of the state. It was identified and released by the Plant Materials Identification Committee of ICRISAT in 1995