Chemical traits of pigeonpea (Cajanus cajan) pod wall affecting pod fly (Melanagromyza obtusa) damage

Pigeonpea (Cajanus cajan (L.) Millsp.) is the second important pulse crop in India. Pod fly [Melanagromyza obtusa (Malloch)] is a major pest of long-duration pigeonpea in India. The grain damage caused by this insect pest varies from 20 to 80%. The concealed mode of life of pod fly within the pod makes it difficult to control, with chemical insecticides. Therefore, host-plant resistance is an important tool for the management of this pest.

Morphological and cultural variation in different oilseed Brassica isolates of Alternaria brassicae from different geographical regions of India

Variation in morphology and cultural characteristics among 13 representative Indian geographical isolates from 219 collections of Alternaria brassicae, the causal agent of Alternaria blight of rapeseed-mustard, was studied. All the isolates showed high level of variability in vitro in respect of conidia length, width, beak length and number of septa. Conidia of Nazirhat isolate (SS 04) were smallest in size with lowest number of septa.

Identification of Fusarium wilt-resistant sources of long-duration pigeonpea (Cajanus cajan)

Present investigation was carried out during 2000–10 to identify and develop the wilt resistant donors of long duration pigeonpea [Cajanus cajan (L.) Millsp.]. Four long duration pigeonpea genotypes, viz IPA 16 F, IPA 8 F, IPA 9 F and IPA 12 F possessing acceptable yield levels were evaluated for their reaction to wilt disease in wilt sick plots continuously for three to five years at hot spots in north east plain zone, central zone and south zone of the country. All the four genotypes showed resistant to moderately resistant reaction to wilt over the years at all the hot spots.

Interactive effect with AM fungi and Azotobacter inoculated seed on germination, plant growth and yield in cotton (Gossypium hirsutum)

Studies were carried out to evaluate the response of cotton to inoculation with IAA producing diazotroph, Azotobacter chroococcum. The effect of A. chroococcum inoculation on cotton seed germination and seedling development was observed to be beneficial for both parameters. A field experiment was also conducted to ascertain the effects of dual inoculation of A. chroococcum (CBD-15, M-4, BA-l and OA-4) as seed application and AM fungi as soil inoculant on cotton (Gossypium hirsutum L.) var. Pusa 8-6.

Change in storage enzymes activities in natural and accelerated aged seed of wheat (Triticum aestivum)

A study was conducted during 2006–10 on seed of six varieties of wheat (Triticum aestivum), viz C 306, PBW 502, WH 542, WH 711, WH 283 and RAJ 3765 were subjected to natural vis-à-vis accelerated ageing conditions and evaluated for change in storage enzymes activities in natural and accelerated aged seed of wheat. The present investigation revealed that the level of various antioxidant enzymes have been studied so as to find the exact cause of seed deterioration.

Pedotransfer functions for predicting points on the moisture retention curve of Indian soils

Limited numbers of pedotransfer functions (PTFs) for predicting the soil moisture transmission parameters are available for the Indian soils. These PTFs have been developed from limited datasets and are area specific, limiting their applicability elsewhere. Secondary data from various sources often have non-systematic errors and lacking in uniformity. The present study makes an attempt to explore the possibility of developing PTFs from wide textural range of Indian soils for four points on the moisture retention curve, –33, –100, –500 and –1 500 kPa.

Interactive effect of elevated CO₂, drought and weed competition on carbon isotope discrimination (Δ¹³ C) in wheat (Triticum aestivum) leaves

An experiment was conducted in open top chambers (OTCs) during 2006–07 to study the carbon isotope discrimination (Δ¹³C) in wheat (Triticum aestivum L. emend Fiori & Paol.) leaves in response to elevated CO₂, drought and competition by weeds (Phalaris minor, Chenopodium album and Avena fatua). It was observed that drought and weed competition had decreased the Δ whereas, elevated CO₂ had increased the Δ and partially ameliorated the negative effects of drought and weeds on Δ.

Effect of tillage practices and residue management on soil quality and crop yield under maize (Zea mays)-based cropping system in Mollisol

A field experiment was conducted during rainy (kharif) and winter (rabi) seasons of 2007–08 and 2008–09 to evaluate the feasibility and suitability of tillage and residue management practices for soil physico- chemical properties, irrigation water requirement, yield attributes and yield of maize (Zea mays L.) in maize–maize crop rotation on Mollisol. Methods comprised the tillage and residue management namely zero tillage with (ZT+r) or without maize residue (ZT-r), raised fresh bed (RFB), permanent raised bed with partial maize residue (PRB+r) and convention tillage (CT).

Effects of modified atmosphere packaging on physico-chemical characteristics and sensory evaluation of bitter orange (Citrus aurantium)

The present study was undertaken to evaluate the effect of modified atmosphere packaging (MAP) during storage on some quality parameters of bitter orange. Physical, chemical, and sensory properties were monitored at 4 ºC for 20 days. Bitter oranges were sanitized, peeled, segmented and packed under normal (21%O₂ +79% N₂ as passive MAP) and two modified atmospheres (20% O₂+20% CO₂+60% N₂ as active MAP1 and 60% O₂+30% CO₂ +10% N₂ as active MAP2) in polyethylene (PE) trays. In general, there was no significant effect of MAP observed in chemical properties (P> 0.05).

Micro-tuber production behaviour of some commercially important potato (Solanum tuberosum) cultivars

Micro-tuber production behaviour of six commercially important cultivars of potato (Solanum tuberosum L.) was studied under standard medium and culture conditions using ten double node cuttings per flask. Significant differences were observed among the different potato genotypes for most of the characters during in vitro tuberization. Per cent micro-tuberization and number of stolons per nodal cutting were found to be maximum in Kufri Badshah and minimum in Kufri Pukhraj.

Effects of cytoplasm on heterosis for agronomic traits in upland cotton (Gossypium hirsutum )

The effects of cytoplasm on productivity and heterosis for seed cotton (Gossypium hirsutum L.) yield and its component was studied in 64 hybrids . Four male sterile (A) lines CMS F 505, CMS CSH 2379, CMS LRA 5166 and CMS Jhorar and their corresponding maintainer (B) lines were crossed with eight restorer lines in a line × tester design. The 64 crosses and a standard check, CSHH 198, were grown in a randomized block design with three replications during 2008–09. Analysis of variance revealed significant differences among genotypes.

Horticulture Practical Manual

Exercise 1: Tools and equipments of use in fruit crop breeding ; Objective :To acquaint with different tools, equipments, chemical reagents and other accessories of use in fruit breeding. Exercise 2: Studies on bearing habit and flower structure Objective :To generator know how on floral biology of fruit crops.
Materials Notched scissors, forceps, needles, camel’s hair brush, polythene bags, magnifying lens, dissecting microscope, sharp blade.
Exercise 3: Pollen collection, its preparation and storage
Objective

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