A field experiment involving eight treatments with different spacing (25 cm row spacing with 25 cm, 20 cm, and 15 cm intra-row spacing; and 20 cm row spacing with 20 cm, 15 cm, and 10 cm intra-row spacing) and fertilizer levels (100% and 125% Recommended Dose Fertilizer-RDF) was conducted in Tamil Nadu Agricultural University, Coimbatore, India during late Samba (September-January) season, 2018-19. The trial aimed to study the effect of high-density planting on dry-matter partitioning and nutrient uptake of rice. The experiment was conducted in a randomized block design with three replications. Results showed that higher dry-matter partitioning of leaf, culm, root and panicle were obtained under closer plant spacing of 20cm x 10 cm over other treatments while lower dry-matter accumulation was recorded at wider crop geometry of 25cm x 25 cm. The nutrient uptake recorded at 25cm x 15 cm with 125% RDF was superior over other treatments followed by 20cm x 10 cm with 100% RDF while the SRI method of planting (25cm x 25 cm) recorded lower nutrient uptake. The experimental results inferred that nutrient uptake is more similar to dry-matter. The conventional method of cultivation with 20cm x 10 cm, produced more dry-matter in all plant parts of rice and foraged higher nutrients compared to all other wider spacing treatments with SRI methodology.
A field experiment was conducted during the late Samba (September-January) season of 2018-19 to evaluate the growth, root characters, and yield of rice due to high-density planting. The soil of the experimental field was clay loam in texture with a neutral reaction. The experiment consisted of eight treatments with different spacing and fertilizer levels such as T 1-25cm x 25cm with 100% Recommended Dose of Fertilizers (RDF), T 2-25cm x 20cm with 100% RDF, T 3-25cm x 15cm with 100% RDF, T 4-25cm x 15cm with 125% RDF, T 5-20cm x 20cm with 100% RDF, T 6-20cm x 15cm with 100% RDF, T 7-20cm x 15cm with 125% RDF and T 8-Conventional cultivation (20cm x 10cm with 100% RDF) and replicated thrice. The results revealed that significantly taller plants were recorded with all SRI treatments (T 1 to T 7) compared to conventional planting in all the stages except at maturity, which resulted in non-significant results. A reverse trend was noted with leaf area index and straw yield. Root length and root volume of rice were higher in wider planted treatments (T 1 , T 2 , and T 5) than other closer spaced treatments with the least in T 8. Treatments T 5 , T 4 and T 3 produced significantly higher grain yield over other treatments with the minimum in T 8. The results inferred that too wider and too closer spacing levels under the SRI method would lead to a reduction in yield though other growth parameters were recorded more.
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