Thumbnail Image

Theses

Browse

20202
 Reset filters

Settings

Subject: Soil Sciences ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    EFFECT OF PHOSPHORUS, MOLYBDENUM AND ORGANICS ON SOIL QUALITY AND CROP PERFORMANCE OF BLACKGRAM UNDER RAINFED ECOLOGY OF JAMMU
    (Division of Soil Science and Agricultural Chemistry Sher-e-Kashmir University of Agricultural Sciences & Technology of Jammu, Main Campus, Chatha, Jammu, 2020-01-01) Shah, Tajamul Islam; Sharma, M. P.
    100 soil samples from blackgram growing rainfed areas of Jammu were collected and analyzed for various physico-chemical properties and available nutrients. The results revealed that soil was low in available nitrogen (N) (229.0 kg ha-1) and medium in phosphorus (P) (12.7 kg ha-1) and potassium (K) (178.4 kg ha-1). However, available molybdenum (Mo) (0.282 mg kg-1) in soil was in sufficient range. The correlation matrix revealed that available nutrients were negatively correlated with electrical conductivity, bulk density and sand content where as positive correlation between available nutrients with organic carbon and silt was observed. Also, available nutrients except Mo were negatively correlated with soil pH while positive relationship was obtained between clay and available nutrients (except P). A field experiment entitled “Effect of phosphorus, molybdenum and organics on soil quality and crop performance of blackgram under rainfed ecology of Jammu” was conducted at research farm of Advance Centre for Rainfed Agriculture, Dhiansar, SKUAST-J during 2016 and 2017. The experiment consisted of 13 treatments comprising different combinations of chemical fertilizers, organic manure and biofertilizers viz. T1: Control, T2: P20 + PSB, T3: P20 + PSB + Rhizobium, T4: P20 + PSB + Rhizobium + FYM, T5: P20 + 0.5Mo + PSB, T6: P20 + 0.5Mo + PSB + Rhizobium, T7: P20 + 0.5Mo + PSB + Rhizobium + FYM, T8: P40 + PSB, T9: P40 + PSB + Rhizobium, T10: P40 + PSB + Rhizobium + FYM, T11: P40 + 0.5Mo + PSB, T12: P40 + 0.5Mo + PSB + Rhizobium, T13: P40 + 0.5Mo + PSB + Rhizobium + FYM. Blackgram cultivar (Uttara) was taken as test crop. The results reflected that soil of the experimental site was sandy loam in texture, slightly acidic in nature, low in organic carbon (OC) content and available N; medium in available P and K and high in available Mo. The water holding capacity (WHC) and soil porosity significantly improved under treatments which received combined applications of inorganics and organics over rest of the treatments as well as initial status of soil. Application of inorganics plus organics brought about significant improvement in general bacterial and fungal count; dehydrogenase activity; labile carbon (LC), particulate organic carbon (POC) and microbial biomass carbon (MBC), available N, P, K and Mo of the post-harvest soil samples. Balanced sheet with regard to available nutrients viz. N, P, K and Mo were found positive under all treatments except control while phosphorus use efficiency was found maximum under treatment T7. Soil quality index (SQI) developed for different treatment varied from 0.105 to 0.398. The magnitude of share of key soil quality indicators for influencing SQI were WHC, dehydrogenase, bacteria and available P. The yield of blackgram in terms of grain and straw and yield attributing characters viz. number of pods per plant and number of grains per pod were found significantly higher under T13 during both the years of experiment. The treatment T13 registered higher number of nodules per plant recorded at 40 DAS during 2016 and 2017. The lowest number of nodules, pods per plant, grains per pod, grain and straw yield; N, P, K and Mo uptake by blackgram were obtained under T1 i.e., control. Also, the results of the present investigation revealed that uptake of nutrients (N, P, K and Mo) by blackgram increased significantly by enriching the soil with P40 + 0.5Mo + PSB + Rhizobium + FYM (T13) during both the years of study.
  • Thumbnail Image
    ThesisItemOpen Access
    EFFECT OF NITROGEN FIXING BIOFERTILIZERS ON ITS DYNAMICS AND ITS USE EFFICIENCY IN IRRIGATED BASMATI
    (Division of Soil Science and Agriculture Chemistry Sher-e- Kashmir University of Agricultural Sciences and Technology of Jammu Main Campus, Chatha, Jammu, 2020-09-28) Kaur, Paramdeep; Mondal, Asim Kumar
    Considering biofertilizer use in basmati rice to manage nitrogenous fertilizers being increasing day by day, an investigation entitled “Effect of nitrogen fixing biofertilizer on its dynamics and its use efficiency in irrigated basmati” was conducted at the research farm of division of Soil Science and Agriculture Chemistry, Chatha SKUAST-Jammu. The objectives of this study were assessment of nitrogen dynamics with different biofertilizer for better nitrogen use efficiency in basmati-370, and to standardize the fertilization dose. The experiment was laid out in randomized complete block design (RCBD) with following treatments: T1: Control (unfertilized), T2: 100% recommended chemical nitrogenous fertilizers, T3: Blue green algae @ 5 kg ha-1, T4: Azospirillum (root dip method), T5: Azolla @ 10 q ha-1, T6: 75% RNF¥ plus BGA @ 5 kg ha-1, T7: 75% RNF¥ plus Azospirillum (root dip method), T8: 75% RNF¥ plus Azolla @ 10 q ha-1, T9: 50% RNF¥ plus BGA @ 5 kg ha-1, T10: 50% RNF¥ plus Azospirillum (root dip method) , T11: 50% RNF¥ plus Azolla @ 10 q ha-1. The soil of the experimental field was sandy clay loam in texture, slightly alkaline pH in reaction, low in available nitrogen and phosphorus and medium in potassium, organic carbon and electrical conductivity in the safer range. The application of integrated use of different biofertilizers along with inorganic nitrogen source significantly improved the growth parameters i.e., plant height, number of tillers, dry matter accumulation that led to the increase in yield attributes which resulted in increase in yield. Moreover, significant relation were found between various growth and yield parameters viz., plant height at 60 DAT and at harvest, dry matter accumulation at 60 DAT and at harvest, number of effective tillers, number of grains per panicle, 1000 grain weight, uptake of N, P K, yield of basmati in grain and straw. The pH and electrical conductivity ranges from 7.27 to 7.35 and 0.14 to 0.19 dSm-1 respectively. The organic carbon ranges from 3.65 to 3.85 g kg-1 and microbial biomass carbon ranges from 79.98 to 110.63 mg kg-1. The significantly highest value of available nitrogen, phosphorus and potassium was obtained in treatment 75% RNF¥ plus BGA @ 5 kg ha-1 (T6) with the value of 146.10, 12.30 and 134.63 kg ha-1 in soil at harvest. Uptake of N, P and K were 42.70, 7.30 and 3.52 kg ha-1 in grain, and 41.18, 7.56 and 20.17 kg ha-1 in straw, respectively. Significantly highest yield was recorded in treatment 75% recommended chemical nitrogenous fertilizers plus BGA @ 5 kg ha-1 which was at par with 75% RNF¥ plus Azospirillum (root dip method) T8. The highest return in terms of rupees and benefit cost ratio was obtained in treatment T6 (2.03). It was concluded that the application of different biofertilizer along with chemical fertilizers can be regarded as best management practice for better soil chemical and biological properties thus yield of basmati under irrigated condition. However, 75% recommended chemical nitrogenous fertilizers plus BGA was effective in terms of increase in grain yield up to 29 % and even shows improvement in yield attributes, nutrient uptake including growth parameters of basmati-370.