Effect of phosphorus nutrition on growth of potato genotypes with contrasting phosphorus effeciency

Abstract

Potato (Solanum tuberosum L.) has high phosphorus requirement for optimum growth and yield. Thus, under P deficiency, growth and yield are considerably reduced. An experiment was conducted in a controlled growth chamber on the effect of P supply on morphological and physiological plant parameters of three potato genotypes having contrasting P efficiency. The genotypes were CGN 17903, CIP 384321.3 and CGN 18233. They were grown under two P levels [100 mg P kg-1 soil (low P) and 700 mg P kg-1 of soil (high P)]. Treatments were arranged in a completely randomised block designs with six replications. Low P supply reduced shoot dry matter yield, relative growth rate, leaf number, whole plant relative leaf expansion rate, total leaf area per plant, plant height and net assimilation rate of P-inefficient genotype, more than that of the P-efficient genotypes. However, low P supply did not affect net photosynthetic rate per unit leaf area, leaf dark respiration rate, chlorophyll fluorescence rate and electron transport rate of both P-efficient and inefficient genotypes. P-efficient genotype CGN 17903 allocated more dry matter yield to the leaf which might have enabled higher light harvesting, hence contributing to high biomass accumulation of this genotype.

Phosphorus Uptake, Use Efficiency, and Response of Potato Cultivars to Phosphorus Levels

“…Balemi (2009) observed reduction from 35 to 75% in DM production of potato genotypes grown under low P availability. Mondial and Agata showed higher whole plant DM production than the other cultivars under low P level.…”

“…Although several studies have been conducted under P-limiting conditions with a purpose of selecting potato genotypes with high P use efficiency, only the shoot dry matter (DM) production, shoot DM rate, and shoot DM production per unit of P taken up were evaluated (Balemi 2009;Balemi and Schenk 2009a;Balemi and Schenk 2009b;Balemi 2011). However, due to the difference in DM partitioning to tubers (Fernandes et al 2010a) and water content in the tubers (Quadros et al 2009;Fernandes et al 2010b) of potato cultivars, a cultivar with high P use efficiency for shoot DM production might not be high yielding.…”

Effect of plant spacing and fertility level on leaf area variation at different phenological stages of cape gooseberry (Physalisperuviana L.) grown in sodic soil

“…N (Varia et al, 1998), P (Basirat et al, 2011), N and P (Regina and Robert, 1991), N, P and K (Baldissera, 2004;Adekiya and Agbede, 2009). In potato, low P supply reduced total leaf area per plant (Balemi, 2009). Shabani et al, (2012) reported increased leaf area in salinity stressed cherry tomato with increased K + concentration.…”

Control of Acid Phosphatases Expression from Aspergillus niger by Soil Characteristics

“…The most visible effect of its omission or reduction is the substantial decrease in plant growth, as has been reported in potato crops (Balemi et al 2009). Approximately 95-99% of phosphorus is present in the insoluble form, either organic or inorganic, which is unavailable for plant growth.…”