Effects of Different Nitrogen, Phosphorus, Potassium Rates on the Quality and Quantity of Citrus Plants, Variety Thomson Novel Under Rainfed and Irrigated Conditions

Abstract

2 Plants require nutrients including nitrogen (N), phosphorus (P), and potassium (K) for their growth and production. Although there have been previously extensive research work regarding the effects of NPK on plant growth, data related to the effects of long term application of NPK on the quality and quantity of citrus under rainfed and irrigated conditions are little. Accordingly, such effects were evaluated in this research work using different chemical fertilization factorially combined and on the basis of a completely randomized block design. Using ammonium sulfate (100, 150 and 200 g tree −1 ), triple super phosphate (0, 25, 50, and 75 g tree −1 ) and potassium sulfate (0, 50, 100, 150 g tree −1 ) the quantity and quality of citrus fruit, variety Thomson were determined in a 10-year experiment in two different research stations in Ramsar, Iran. NPK fertilization significantly affected the quality and quantity of citrus fruits, indicating the significance of NPK fertilization for citrus production.

Standardization of Doses of Phosphorus and Potasium on Growth and Fruit Quality of Young Kinnow (Citrus Reticulate Blanco)

“…Different levels of P and K effected significantly on number of aborted of citrus. Results are confirmed the findings of (Altaf et al (2008;Ashkevari et al, 2013) Our results in line with the findings of Salik et al (2000) reported that with the application of phosphorus and potassium showed nonsignificant results regarding juice% in Kinnow. The results confirmed the findings of Obreza and Rouse (1993) juice concentration was unaffected by fertilizer rate.…”

“…Results showed overall non-significant effect of P and K on weight of seeds per fruit. Our results are confirmed findings of (Saeed et al (2011;Ashkevari et al, 2013) concluded that non-significant differences were found among different levels of phosphorus and potassium for seed weight. Our results confirmed the findings by (Altaf, Khan and Hussain (2008;Ashkevari et al 2013) reported that PK effected on aborted seed significantly.…”

“…Minimum value perceived by T 3 (250g P 2 O 5 + 200g K 2 O) depicted 65.41. (Dudi et al, 2007;Ashkevari et al, 2013) reported that phosphorus application significantly effected on number of leaves per shoot from 54.22 to 72.05 at 320 and 480g P 2 O 5 per plant levels of P application . Similarly dose of potassium 210g per plant also increased significantly number of leaves.…”

“…Ahmed et al (2001) concluded that different levels of phosphorus and potassium clearly showed non-significant results regarding citrus plant girth. ( Dudi et al, 2007;Ashkevari et al, 2013) and Smith, Cheary and Carroll (1995) studied the growth behavior of the citrus plant and found a significant interaction was detected for the number of current-season shoots produced from phosphorus application slightly increased the number of current-season shoots. 6).…”

Factors affecting citrus fruit quality: Emphasis on mineral nutrition

“…Ashkevari et al (2013), while evaluating phosphate fertilization (25, 50 and 75 g of triple superphosphate, plant -1 , 3 times per cycle) in drought conditions on grapefruit (Citrus paradisi Macf.) and orange (Citrus sinensis L.…”