Bush bean is an important pulse crop that enriches the Rwandan diet and is a source of cash. This staple crop is widely grown in Rwanda. However, the improper spacing and inadequate application rates of organic inputs result in low yields. The purpose of this study was to evaluate the effect of intra-row-spacing and pymarc application rate on selected soil chemical parameters and bush bean (Phaseolus Vulgaris L) yield on andosol under rainfed conditions. The experiment included five pymarc rates with four replications in a randomized complete block design: P0(No fertilizer), P1(250 kg ha-1 of NPK), P2(10 t ha-1 of pymarc + 250 Kg ha-1 of NPK), P3(15 t ha-1 of pymarc + 250 Kg ha-1 of NPK) and P4(20 t ha-1 of pymarc + 250 Kg ha-1 of NPK) and 3 spacing levels: S1(40 cm x 15 cm), S2(40 cm x 20 cm) and S3(40 cm x 30 cm). The results indicated that a significant difference was found between treatments and their interactions except for pH (p<0.05). Regarding pymarc treatments, P4 contained greater amounts of organic C(5.30 %), total N(0.30 %), available P(56.70 ppm), available K(81.30 mg dm-3), exchangeable Ca(12.61 Cmol Kg-1) and Mg(5.0 Cmol Kg-1) at harvesting compared to P0 and P1. According to plant spacing, S3 held higher amounts of OC(4.85 %), av. P(55.15 %), av. K(60.94 mg dm-3), exch. Ca(11.0 Cmol Kg-1) and exch. Mg(3.6 Cmol Kg-1) than S1. There was an interaction effect of pymarc and spacing on measured soil chemical properties except for soil pH. The correlation analysis between nutrients was positive, highly significant (p<0.01), and varied from moderate to strong (0.4<r<0.7 and r>0.7) except pH. The treatment with the highest bush bean yield was P2S1 with 3.03 t ha-1 and therefore it can be recommended to bush bean farmers of the volcanic highland region.
Bush bean is the poor families’ meat in Rwanda and grown in many corners of the country. However, unevenness application of organic and inorganic amendments brought soil degradation including soil toxicity or deficiency and low bush bean production. The objective of this study was to evaluate the effect of pymarc rates with NPK and spacing on Soil organic matter, physical parameters and bush bean yield parameters in volcanic highland. The design was RCBD with four replications and the experiment had two factors; Pymarc rates: P0(control), P1(250Kg ha-1 NPK), P2(10 tons ha-1 pymarc+250 Kg ha-1 NPK), P3(15 tons ha-1 pymarc+250Kg ha-1 NPK) and P4(20 tons ha-1 pymarc+250Kg ha-1 NPK) and spacing levels: S1(40cm x15cm), S2(40cm x 20cm) and S3(40cm x 30cm). Results showed that, highly significant difference (p<0.01) was in treatments and greatest improvements were brought out by P2S1 with lowest Bd(0.95 g cm-3), highest WHC(38.34 %) and porosity(42.18 %) at harvesting with mean yield of 3.03 t/ha compared to P0S3 with least values of studied attributes. Highest SOM content was found out in P4S3 and P3S1 of 9.84 % and 9.75 % sequentially. The correlation analysis results between WHC, Porosity, SOM and yield varied from weak to strong (0.4>r, r>0.7), significant (p<0.05) and positive while the same relationship but negative existed between Bd and other parameters. Therefore, sowing the bush bean at the spacing of 40cm x15cm with application of 10t ha-1 pymarc+250 Kg ha-1 NPK 17-17-17 could be recommended to agronomists and farmers from volcanic highland in Rwanda for bush bean optimum yield.
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