Pyrethrum marc rates and intra-row spacing influence on selected soil chemical parameters and yield of bush bean (Phaseolus Vulgaris L.) grown on andosol under rainfed conditions

Bush bean is an important pulse crop that enriches the Rwandan diet and a source of cash. This staple widely grown in Rwanda. However, improper spacing inadequate application rates organic inputs result low yields. The purpose this study was to evaluate effect intra-row-spacing pymarc rate on selected soil chemical parameters bush (Phaseolus Vulgaris L) yield andosol under rainfed conditions. experiment included five with four replications randomized complete block design: P0(No fertilizer), P1(250 kg ha-1 NPK), P2(10 t + 250 Kg P3(15 NPK) P4(20 3 levels: S1(40 cm x 15 cm), S2(40 20 cm) S3(40 30 cm). results indicated significant difference found between treatments their interactions except for pH (p<0.05). Regarding treatments, P4 contained greater amounts C(5.30 %), total N(0.30 available P(56.70 ppm), K(81.30 mg dm-3), exchangeable Ca(12.61 Cmol Kg-1) Mg(5.0 at harvesting compared P0 P1. According plant spacing, S3 held higher OC(4.85 av. P(55.15 K(60.94 exch. Ca(11.0 Mg(3.6 than S1. There interaction measured properties pH. correlation analysis nutrients positive, highly (p<0.01), varied from moderate strong (0.4<r<0.7 r>0.7) treatment highest P2S1 3.03 therefore it can be recommended farmers volcanic highland region.