Effects of tillage and planting geometry on the performance of maize hybrids
Tika Bahadur Karki1*, Jiban Shrestha1, Santa Bahadur BK1 and Jitendra Yadav1
An experiment was conducted during the spring season of 2013 at Rampur, Chitwan, Nepal. The experiment was laid out in a strip plot design with three replications having 12 treatments, and consisted of two tillage treatments: no tillage (NT) and conventional (CT), two genotypes: Rampur Hybrid-2 and RML-32/RML-17, and three planting geometries: D1=75cm× 25cm, D2=70cm× 25cm and D3= 60cm×25cm between rows and between plants, respectively. Higher Normalized Difference Vegetation Index (NDVI) values of 0.747 were recorded in NT over the CT with 0.657. Rampur Hybrid-2 had the lowest value of NDVI with 0.747 and the highest value was found in RML-32/RML-17 with 0.757. Plant height in CT (167.88 cm) was higher than one (167.17 cm) in NT. Similarly, the highest plant height of 169.91cm was recorded in RML-32/RML-17 over 165.14 cm in Rampur Hybrid-2. The highest number of cobs (73,177 /ha) was recorded at G3. A higher number of 27.3 kernels per row in NT was recorded over the 25.8 in CT. RML-32/RML-17 produced the highest test weight of 363.94g over the Rampur Hybrid-2 with 362.17g. Significantly higher grain yield of 9.24t /ha was recorded in planting geometry of D3. The experiments need to be further tested with higher plant population densities in Nepalese hybrids.
Keywords: Hybrid Maize, Plant Geometry, Tillage.