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20192
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Subject: Agronomy × Author: Mandeep Singh × Start date: 1975 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Quantification of growth and forage yield of staggered sown cowpea (Vigna unguiculata L.) using variable seed rate
    (Punjab Agricultural University, Ludhiana, 2019) Mandeep Singh; Sharma, P.K.
    The field studies entitled „Quantification of growth and forage yield of staggered sown cowpea (Vigna unguiculata L.) using variable seed rate‟ were carried out using Randomised Complete Block Design at two locations namely Punjab Agricultural University, Ludhiana and its Krishi Vigyan Kendra, Moga. Seven dates of sowing i.e. March 5(D1), March 25(D2), April 14(D3), May 4(D4), May 24(D5), June 13(D6) and July 3(D7) and two seed rates i.e. recommended (30 kg/ha) and 37.5 kg/ha comprised fourteen treatment combinations. Experiment was replicated 4 times at Ludhiana and 3 times at Moga. Ludhiana and Moga soils were normal in pH and EC, low in available N and high in available K. Available P was high and medium in range at Ludhiana and Moga, respectively. The highest and least number of days for initiation and completion of emergence were taken by March 5 (D1) and July 7 (D7) sown crop, respectively. Flowering was observed only in March 5 (D1) sowing date. Crop sown on April 14 (D3) produced the highest number of branches, leaf area, crop growth rate, green and dry fodder yield. The earliest sown crop (D1) had the better fodder quality parameters i.e. Crude protein content, Net gas production, Metabolizable energy, Total digestible nutrients and digestibility. Green fodder yield was significantly increased by 9.3 % and 8.5 % with higher seed rate at Ludhiana and Moga, respectively.
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    ThesisItemOpen Access
    Nitrogen use efficiency of new wheat varieties under conservation tillage
    (Punjab Agricultural University, Ludhiana, 2019) Mandeep Singh; Jayesh Singh
    A field experiment was conducted during rabi season of 2016-17 at two locations representing two different environments (one being the research area of Dept. of Plant Breeding and Genetics at Punjab Agricultural University, Ludhiana (Punjab) and the other being the KVK, Amritsar) to evaluate the nitrogen use efficiency of new wheat varieties by changing the tillage regime from conventional to conservation tillage using happy seeder. The soil of the experimental field at Ludhiana were loamy sand in texture with low in organic carbon, medium in available P and sufficient in K while it was silty loam in texture with low in organic carbon, medium in available P and sufficient in available K at Amritsar. The experiment was replicated thrice in a strip plot design with three varieties viz. PBW 725, PBW 677 and HD 2967 in conventional (CT) and conservation tillage using happy seeder (HS) making a total of six vertical plots i.e. variety HD2967 sown under conservation (HSHD2967) and conventional (CTHD2967) tillage, variety PBW725 sown under conservation (HSPBW725) and conventional (CTPBW725) tillage and variety PBW677 sown under conservation (HSPBW677) and conventional (CTPBW677) tillage. Three graded doses of nitrogen 90 (N90), 120 (N120) and 150 kg N/ha (N150) along with a control (N0) were laid across horizontal plots. The growth of different wheat varieties were recorded periodically in terms of plant height, leaf area index, number of tillers m-2, dry matter accumulation and photosynthetically active radiation (PAR) interception. All these growth parameters significantly increased under conservation tillage with residue retention(HS) as compared to conventional tillage (CT) without any crop residue. The micrometeorological parameters like NDVI and canopy temperature for different wheat varieties under variable tillage regime remained unaffected under graded doses of N. The grain yield and yield components in terms of effective tillers m-2of all the three varieties improved significantly under happy seeder sowing than their counterparts raised under CT both at Ludhiana and Amritsar. The variety PBW 725 when raised under conservational tillage (HSPBW725) being at par to PBW 677 under similar tillage regime (HSPBW677) significantly outyielded HD 2967 under conservational tillage (HSHD2967) and all the varieties under conventional tillage (CTPBW725, CTPBW677 and CTHD2967). N uptake of the variety PBW 725 grown under happy seeder (HSPBW725) being at par to PBW 677 and HD 2967 under similar tillage regime (HSPBW677) was significantly better than all the varieties under conventional tillage (CTPBW725, CTPBW677 and CTHD2967) resulting in better nitrogen use efficiency (NUE) indices and performed best under HS at both locations. The application of nitrogen @ 120 kg ha-1 (N120 kg ha-1)being at par to N150 kg ha-1resulted in enhanced growth and productivity and it helped in maintaining the soil fertility status over the lower rates of N.None of the interaction between tillage x varieties x N levels were found significant for any growth and yield trait.