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Author: BAKTASH, ABDUL MATEEN × Start date: 2021 ×
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    ThesisItemOpen Access
    STUDIES ON NITROGEN CONTRIBUTION IN RICE GROWN UNDER SYSTEM OF RICE INTENSIFICATION
    (CSKHPKV, Palampur, 25-07-17) BAKTASH, ABDUL MATEEN; Datt, Naveen
    Azolla was grown in pots and trays in the month of February, 2016 under laboratory and field condition. Azolla was also grown in the field by making trenches (2m × 2m × 0.2m) in the month of March, 2016 and was evaluated for its biomass production in the subsequent months up to October, 2016 and has a potential of 19 t ha-1 and was also analyzed for manurial content. Azolla has nitrogen fixation rate (13.94 n moles C2H4g-1 Dwt min-1), total carbon (35 %), and total nitrogen (4.1 %), C: N ratio (9.56), protein content (25.62 %), P (1.1 %), K (4.5 %), Ca (0.20 %), Mg (0.21 %) ,S (0.49 %), Zn (38 mg kg-1), Fe (3900 mg kg-1), Mn (762 mg kg-1) and Cu (16 mg kg-1). An experiment was conducted at Water Management Farm, CSKHPKV, Palampur by taking rice crop during kharif, 2016 to study the effect of Azolla alone and in combination with graded doses of fertilizer nitrogen by taking twelve treatments and three replications in randomized block design. The soil sample before sowing of crop was taken and was analyzed for physical, chemical and microbiological properties. The representative soil was having texture silty clay loam, pH 5.5, cation exchange capacity 8.50 cmol (p+) kg-1, organic carbon 8.70 g kg-1, available N, P and K 377.5 kg ha-1, 17.8 kg ha-1 and 159.5 kg ha-1 respectively, microbial biomass carbon 113.6 μg g-1, urease activity 4.12 μg g-1 min-1 and phytase activity 0.34 μg inorganic P solid g-1 hr-1. The yield attributes of the crop were recorded, highest plant height was found in 50 kg N ha-1 + 8 t Azolla, number of tillers m-2 125 kg N ha-1 + 8 t Azolla and effective tillers m-2 were observed in treatment having 100 kg N ha-1 + 8 t Azolla and highest grains per panicle was recorded in treatment having 125 kg N ha-1 +4 t Azolla. The highest grain and straw yield was recorded in treatment having 125 kg N ha-1 + 8 t Azolla. After the harvest of crop, soil samples from each plot were taken from the depth of 0-0.15 m and analyzed for chemical, microbiological and physical properties of soil. The results revealed that an increase in pH (5.57) was observed with application of Azolla and fertilizer nitrogen combinedly. Maximum organic carbon (8.90 g kg -1) and the highest CEC [8.73 cmol (p+) kg-1] were found in treatment 125 kg N ha-1 + 8 t Azolla 1; available N (402.8 kg ha-1), P (18.87 kg ha-1) and K (169.4 kg ha-1) were recorded in treatment 125 kg N ha-1 + 8 t Azolla. Highest microbial biomass carbon (113.6 μg g-1) was found in treatment 125 kg N ha-1 + 8 t Azolla. Phytase (0.68 μg inorganic P solid g-1 hr-1) and urease (17.34 μg g-1 min-1) activity was significantly higher in treatments with 4 t or 8 t Azolla in combination with graded doses of fertilizer nitrogen than fertilizer nitrogen alone and 4 t Azolla alone. Total N, P, K content and NPK uptake was found maximum in the treatment 125 kg N ha-1 + 8 t Azolla. Build up of N was found in the treatments having 4 t Azolla, 8 t Azolla, whereas K build up was found in 100 and 125 kg nitrogen, 4 t Azolla, 100 kg N ha-1 + 4 t Azolla and 125 kg N ha-1 + 4 t Azolla . It was concluded that 50 and 100 kg of nitrogen ha-1 can be saved with the application of 4 t and 8 t Azolla ha-1. ________________________ _____________________ (Abdul Mateen Baktahs) Student Date: 25th,July, 2017 (Dr. Naveen Datt) Major Advisor Date: 25th,July, 2017 ___________________ Head
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    ThesisItemOpen Access
    STUDIES ON NITROGEN CONTRIBUTION IN RICE GROWN UNDER SYSTEM OF RICE INTENSIFICATION
    (CSK HPKV, Palampur, 25-07-17) BAKTASH, ABDUL MATEEN; Datt, Naveen
    Azolla was grown in pots and trays in the month of February, 2016 under laboratory and field condition. Azolla was also grown in the field by making trenches (2m × 2m × 0.2m) in the month of March, 2016 and was evaluated for its biomass production in the subsequent months up to October, 2016 and has a potential of 19 t ha-1 and was also analyzed for manurial content. Azolla has nitrogen fixation rate (13.94 n moles C2H4g-1 Dwt min-1), total carbon (35 %), and total nitrogen (4.1 %), C: N ratio (9.56), protein content (25.62 %), P (1.1 %), K (4.5 %), Ca (0.20 %), Mg (0.21 %) ,S (0.49 %), Zn (38 mg kg-1), Fe (3900 mg kg-1), Mn (762 mg kg-1) and Cu (16 mg kg-1). An experiment was conducted at Water Management Farm, CSKHPKV, Palampur by taking rice crop during kharif, 2016 to study the effect of Azolla alone and in combination with graded doses of fertilizer nitrogen by taking twelve treatments and three replications in randomized block design. The soil sample before sowing of crop was taken and was analyzed for physical, chemical and microbiological properties. The representative soil was having texture silty clay loam, pH 5.5, cation exchange capacity 8.50 cmol (p+) kg-1, organic carbon 8.70 g kg-1, available N, P and K 377.5 kg ha-1, 17.8 kg ha-1 and 159.5 kg ha-1 respectively, microbial biomass carbon 113.6 μg g-1, urease activity 4.12 μg g-1 min-1 and phytase activity 0.34 μg inorganic P solid g-1 hr-1. The yield attributes of the crop were recorded, highest plant height was found in 50 kg N ha-1 + 8 t Azolla, number of tillers m-2 125 kg N ha-1 + 8 t Azolla and effective tillers m-2 were observed in treatment having 100 kg N ha-1 + 8 t Azolla and highest grains per panicle was recorded in treatment having 125 kg N ha-1 +4 t Azolla. The highest grain and straw yield was recorded in treatment having 125 kg N ha-1 + 8 t Azolla. After the harvest of crop, soil samples from each plot were taken from the depth of 0-0.15 m and analyzed for chemical, microbiological and physical properties of soil. The results revealed that an increase in pH (5.57) was observed with application of Azolla and fertilizer nitrogen combinedly. Maximum organic carbon (8.90 g kg -1) and the highest CEC [8.73 cmol (p+) kg-1] were found in treatment 125 kg N ha-1 + 8 t Azolla 1; available N (402.8 kg ha-1), P (18.87 kg ha-1) and K (169.4 kg ha-1) were recorded in treatment 125 kg N ha-1 + 8 t Azolla. Highest microbial biomass carbon (113.6 μg g-1) was found in treatment 125 kg N ha-1 + 8 t Azolla. Phytase (0.68 μg inorganic P solid g-1 hr-1) and urease (17.34 μg g-1 min-1) activity was significantly higher in treatments with 4 t or 8 t Azolla in combination with graded doses of fertilizer nitrogen than fertilizer nitrogen alone and 4 t Azolla alone. Total N, P, K content and NPK uptake was found maximum in the treatment 125 kg N ha-1 + 8 t Azolla. Build up of N was found in the treatments having 4 t Azolla, 8 t Azolla, whereas K build up was found in 100 and 125 kg nitrogen, 4 t Azolla, 100 kg N ha-1 + 4 t Azolla and 125 kg N ha-1 + 4 t Azolla . It was concluded that 50 and 100 kg of nitrogen ha-1 can be saved with the application of 4 t and 8 t Azolla ha-1.