Growth and yield response of different cowpea (Vigna unguiculata (L.) Walp.) varieties under varying phosphorus management
Keywords:
Crop nutrition, Soil fertility managementAbstract
A field experiment was conducted at the Integrated Farming System Research Station (IFSRS) under KeralaAgricultural University (KAU), located at Karamana in Thiruvananthapuram, Kerala, during summer 2021for studying the performance of grain cowpea varieties in summer rice fallows and to assess the influence ofbeneficial phosphorus inoculants in enhancing phosphorus availability for the crop. The treatments includedthree varieties of grain cowpea and five different strategies for phosphorus nutrition. The test crop varietieswere Kanakamony, PGCP-6 and DC-15. Phosphorus levels comprised the KAU recommended dose ofP(RDP) i.e. @30 kg P2O5 ha-1and lower doses of RDP (75 and 50 %) along with either AMF, PSB or both.Factorial RBD was the experimental design followed, with the treatment combinations laid out in threereplications. Growth parameters of the crop including count of branches per plant, root mass and rootvolume; parameters contributing to yield including pod count per plant and average weight of pods weresignificantly higher for the variety PGCP-6 which also recorded higher grain yield and nutrient uptake.Application of AMF and PSB, along with 75 per cent of RDP and with 50 per cent of RDP recorded higherand comparable growth attributes (plant height, count of branches, effective nodulation, AMF rootcolonization, root mass and volume), yield and yield contributing attributes (harvest index, number of podsand grain yield per plant) and uptake of major plant nutrients.References
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