No abstract

Poor quality and fruit fly infested fruit in the rainy season and failure to manipulate production periods are common problems for guava production in India. So, the research work was carried out with a management practices point of view to overcome these problems. Growth characters were significantly influenced by different genotypes. The plant spread, number of sprouted shoots was recorded maximum in cv. Sardar. Marketable yield free from fruit fly infestation were significantly higher recorded in 15 th July time of pruning and its interaction with cv. Sardar. As concerned with qualitative attributes the genotype Sardar was observed better in T.S.S. as compared to other genotypes. RHR-Guv-14 genotype was found to be maximum in ascorbic acid. Sugar: acid ratio was observed higher in RHR-Guv-60. Similarly maximum shelf life of fruit was recorded by the RHR-Guv-14. Very crispy pulp texture and fruit luster was observed in all genotypes except cv. Sardar. From the present investigation, it was found that 15 th July pruning time was found to be better with respect to marketable yield. Pruning time of 15 th September was found to be better in the escape from fruit fly infestation but fruiting was very less. The genotype RHR-Guv-14 may evaluate for the cultivation as hast bahar crop.

The study was carried out to know the mechanism of less or no flowering in well maintained high-density planted (CHDP) guava (Psidium guajava L.) orchard (2 m × 2 m) during 2014 and 2015. Biochemical parameters determine flowering and fruiting in high-density planted guava orchard of 15 years old. Maximum length (17.48 cm), diameter (3.68 mm) of shoot and number of leaves pair (5.49) per shoot were found in flowering plants; highest leaf area (32.20 cm2) was observed in non-flowering plants. With respect to biochemical parameters, total chlorophyll (5.05 mg/g), chlorophyll a (3.02 mg/g), chlorophyll a (2.03 mg/g), total sugars (15949.57 μg/g dry wt.), starch in leaves (2361.50 μg/g dry wt.) and roots (2024.45 μg/g dry wt.) were highest in matured leaves of flowering plants. Whereas, mature leaves of flowering plants of guava showed lowest Chlorophyll a: b ratio (1.58 mg/g). Anthocyanin content was highest (0.052 mg/g) in the immature leaves of flowering plants. Similarly, Chlorophyll b content in leaf was found less (0.72 mg/g) in the non-flowering plant compared to a flowering plant. Allahabad Safeda and L-49 cultivars are better among the four cultivars in such phenomenon of in bearing level of old guava orchard. Relevant information got in the study of Chlorophyll b, which indirectly plays important role in flowering and fruiting. Chlorophyll b increases the range of light, which is used by the plant for producing energy.