Partial rootzone drying and regulated deficit irrigation can be used as water-saving strategies without compromising fruit yield and quality in tropically grown sweet orange

Crop demands for irrigation require different technologies to optimize the use of water. Regulated Deficit Irrigation (RDI) is a strategy that enables a significant reduction of water application without affecting the crop yield and quality, with the advantage of being a tool for control of vegetative growth. The present study was conducted in Sesquile, Cundinamarca (Colombia) between 2015 and 2016. The objective was to evaluate the quality and development of pear crop (Pyrus communis L. cv. Triumph of Vienna) on field conditions, using three treatments of 100%, and 25% of water requirement (ETc) and no irrigation, applied at the rapid fruit growth stage. The mid day stem water potential, plant water relations, pressure-volume curve, fruit yield and quality were evaluated. There were no significant differences in the yield and quality of the fruits among the different irrigation treatments. The trees had the mechanisms of osmotic adjustment, which allowed water stressed trees to cope with irrigation restrictions during the rapid fruit growth stage without affecting the yield.

Download Full-text

Leaf Nutrient Status Vis-à-vis Fruit Yield and Quality of Sweet Orange (Citrus sinensis (L.) Osbeck)

International Journal of Plant & Soil Science ◽

10.9734/ijpss/2019/v31i330212 ◽

2020 ◽

pp. 1-8

Author(s):

A. Ramanjaneya Reddy ◽

V. Munaswamy ◽

P. Venkataram Muni Reddy ◽

B. Ravindra Reddy ◽

P. Sudhakar

Keyword(s):

Citrus Sinensis ◽

Significant Positive Correlation ◽

Sweet Orange ◽

Nutrient Status ◽

Significant Negative Correlation ◽

Fruit Yield ◽

Positive Correlation ◽

Yield And Quality ◽

Leaf N

The present study was conducted to know the effect of leaf nutrient status on fruit yield and quality of sweet orange (Citrus sinensis (L.) Osbeck) in YSR district of Andhra Pradesh, India. In this investigation fifty sweet orange orchards aged between 12 to 13 years were selected and plant samples such as index leaves and matured fruits were collected from 10 per cent of plants in each orchard. Leaf Zn deficiency (62%) was the most severe among the 10 mineral elements tested and followed by Fe (54%), Mn (52%) and Cu (26%). Fruit yield showed significant positive correlation with leaf N (r =0.519**) and P (r =0.409**). Fruit weight had significant positive correlation with leaf Nitrogen (r = 0.469**), Phosphorus (r = 0.446**) and Potassium (r = 0.415**). Fruit juice percent was significantly and positively correlated with leaf N (r =0.353**) and P (r =0.364**). Titrable acidity had significant negative correlation with leaf Fe (r = -0.371**) and leaf Mn (r = -0.292*). Total Soluble Solids (TSS) showed a significant positive relation with leaf P (r = 0.438**) and significant negative correlation with leaf Mn (r = -0.311*). Vitamin C content of the sweet orange fruit had significant positive correlation with leaf N (r = 0.437**), P (r = 0.516**) and K (r = 0.398**).

Download Full-text