Defoliation impacts on morpho-physiological attributes and yield of tomato

Abstract

The experiment was conducted under sub-tropical condition during two successive seasons (November-March) of 2017-18 and 2018-19 to investigate the effect of defoliations on morpho- physiological attributes and yield of tomato. The experiment comprised of five levels of defoliation viz., 0 (control), 3, 6, 9 and 12 leaves defoliation from the base out of 17 leaves at the beginning of flowering stage and two widely cultivated varieties viz., TM-110 and TM-135. The plant characters such as leaf area, plant height, number of leaves plant-1, straw weight plant-1, absolute growth rate, number of fruits plant-1, individual fruit weight and fruit yield were not affected up to 6 leaves defoliation irrespective of seasons and genotypes. Interestingly, photosynthesis, nitrate reductase and reproductive efficiency increased with increasing defoliation levels. Morpho-physiological parameters and yield attributes were better in 3 and 6 leaves defoliated plants over the control with being the highest in 6 leaves defoliated plant, which resulting the highest fruit yield. Heavy defoliation not only reduced source sizes but also decreased total sink (fruits) causing lower fruit yields. The lowest morpho-physiological attributes and fruit yield was recorded in 12 leaves defoliated plants. These results indicate that tomato plants can tolerate one-third leaf loss during reproductive stage and the knowledge of which might be essential for maintaining better quality tompato production. SAARC J. Agric., 20(1): 87-96 (2022)

Assessment of yield and profitability of Indian mustard (Brassica juncea) with foliar fertilization under rainfed condition

“…The foliar spray of watersoluble complex fertilizer (18 : 18 : 18) @ 0.5% + 0.5% ZnSO 4 resulted in significantly highest seed yield (3.28 t/ ha) among all the foliar spray treatments (Table 4). Adequate crop nutrition improved the vegetative and reproductive growth, as was evident from taller and vigorous plants having more dry-matter accumulation and thus, the plant can attain a greater number of siliquae/plant, seeds/ siliqua and yield-contributing parameters and ultimately the seed yield (Mondal et al, 2018). Stover yield (9.01 t/ha) was found higher in foliar spray of water-soluble complex fertilizer (18 : 18 : 18) @ 0.5% + 0.5% ZnSO 4 , followed by water-soluble complex fertilizer (18 : 18 : 18) @ 0.5% spray.…”

Respons Pertumbuhan Dan Hasil Padi Tercekam Salinitas Pada Penambahan Berbagai Bahan Organik Dan Perbedaan Umur Bibit

“…Hal ini menyebabkan penurunan pada berbagai karakter fisiologis dan agronomi sehingga menghasilkan produktivitas yang rendah. Berdasarkan penelitian Mondal et al (2013) salinitas dengan nilai electrical conductivity (EC) sebesar 6-12 dS/m menyebabkan penurunan jumlah anakan, kandungan klorofil, laju fotosintesis, dan indeks panen pada tanaman padi. Pada penelitian lainnya, padi varietas Dendang yang ditanam pada lahan pasang surut dengan kandungan garam 1,35 sampai >25 dS/m menggunakan sistem surjan mampu meningkatkan karakter agro-fisiologi (Nasrudin & Kurniasih, 2021).…”

Physiological and Proteome Analysis of the Effects of Chitosan Oligosaccharides on Salt Tolerance of Rice Seedlings

“…Approximately 20% of the world’s irrigated agricultural lands are adversely affected by soil salinization [ 2 ]. Salt stress is an abiotic stress that affects normal growth and production, and high salinity can lead to a reduction of 30–80% in rice production [ 3 ]. Salt stress causes many aspects of rice defense reactions, such as changes in cell structure, physiology, shape and structure, biochemical synthesizing and activation of other molecules [ 4 , 5 , 6 ].…”