{'fraction_non_alphanumeric': 0.025423728813559324, 'fraction_numerical': 0.026836158192090395, 'mean_word_length': 5.3056379821958455, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Influence of diazotrophicus Azospirillum on growth , flower yield and N uptake of Chrysanthemum

A field study was conducted to ascertain the effect of Azospirillum OAD-2 (isolated from Gaillardia pulchella) with different nitrogen fertilizer levels viz, 0, 50, 75 and 100 percent recommended dose of nitrogen (RDN) on growth, nitrogen uptake and flower yield of Chrysanthemum morifolium. The results revealed that Azospirillum sp. inoculation significantly increased the plant growth, flower yield and nutrient uptake of chrysanthemum when compared to uninoculated control plants. Application of nitrogen in addition to inoculation with Azospirillum further enhanced the plant growth yield parameters and nutrient uptake significantly. The plant receiving 100 percent RDN and Azospirillum inoculation significantly produced the maximum of flower yield (35.25 t h) biomass yield (7.26 g plant at maximum flowering stage) and nitrogen uptake (71.23 kg ha), when compared to all the other treatments. However, least flower (23.12 t ha) and biomass (3.33 g plant at maximum flowering stage) yields and nitrogen uptake (42.33 kg ha) were observed in uninoculated and fertilizers control plants. Inoculation of Azospirillum in combination with application of 75 percent RDN showed (34.26 t ha) statistically same flower yield as that of 100 percent RDN (35.25 t ha) indicating the possibility of reducing input cost on N-fertilizers. Significant increase in available nitrogen content of soil was also noticed due to inoculation of Azospirillum at all growth stages of plant growth. The population of Azospirillum significantly enhanced in all the inoculated rhizospheres, when compared to uninoculated control rhizosphere. The maximum population of Azospirillum harbored in the 100 percent RDN and Azospirillum treated plant (58.5 X 10), which was significantly more then all other treated rhizosphere. Based on the present study it can be concluded that inoculation of Azospirillum to chrysanthemum substitutes the 25 percent of nitrogen application to soil and reduce the input cost and sustain the soil fertility in the soil.