1Krishi Vigyan Kendra (Farm Science Centre), Senapati District, P.O. Kangpokpi-795129, Manipur-India
2Visva-Bharati University, Soil Science and Agricultural Chemistry, Sriniketan – 731 236, West Bengal, India
3Central Agricultural University, College of Agriculture, Iroisemba, Imphal, 795004, Manipur, India
4Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Saffron Research Station, Pampore-191121, Jammu and Kashmir, India
5Department of Horticulture and Soil Conservation, Imphal East, 795001, Manipur, India
In an field experiment conducted on pea (Pisum sativum L.) during rabi season of 2013–14 in acid soil of Senapati district, Manipur, India phosphorus was given in the form of single super phosphate and levels of P2O5 kg ha-1 (0, 40 and 60) had significant influence on total dry matter yield, phosphorus concentration in plants and phosphorus uptake by plant. Six extractants were tried viz. Bray 1, Bray 2, Mehlich 1, Mehlich 3, Troug and Olsen to assess the available phosphorus status of the acid soils. The suitability of these extractants was in the descending order: Bray 1> Troug> Bray 2> Mehlich 3> Olsen (pH-8.5)> Mehlich 1. Bray's P 1 extractable phosphorus showed the highest and positive correlations with dry matter yield (control) phosphorus content (control), phosphorus uptake (control), Bray's percent yield and uptake. Therefore this extractant may be used as an index of available phosphorus for pea (Arkel) grown on acid soils of Senapati district, Manipur, the critical level being 14 ppm (mg/kg). The critical limit of phosphorus concentration in plant at 40 days of planting was 0.42% according to the graphical procedure of Cate and Nelson (1965) using a scattered diagram.
Almost 85% of soils in the Northeastern region especially in Manipur are moderate to strongly acidic. Phosphorous (P) enhances many aspects of plant physiology, including the fundamental processes of photosynthesis, nitrogen fixation, flowering, fruiting (including seed production), and maturation. Pea has a relatively high requirement for phosphorus, yield and seed quality can be enhanced by phosphorus. Six extractants were tried viz. Bray 1, Bray 2, Mehlich 1, Mehlich 3, Troug and Olsen to assess the available phosphorus status of the acid soils. Bray's P1 extractable phosphorus showed the highest and positive correlations with dry matter yield (control) phosphorus content (control), phosphorus uptake (control), Bray's percent yield and uptake.
Pea, phosphorus, acid soils, Bray's percent yield, critical limit
