Effect of Foliar Application with Potassium Nitrate and Copper Sulfate on Fruit Yield and Quality of Pear (Pyrus communis L.) Trees

Figures & data

Table

Determination	Attributes
Nitrogen (%)	0.054
Phosphorous (mg kg^−1)	9.00
Potassium (mg kg^−1)	110
Organic matter (%)	0.83
pH	7.3
Texture class	Clay loam

Table 1. Fruit weight, fruit yield tree⁻¹, fruit drop, and fruit juice pH as affected by potassium nitrate and copper sulfate levels.

Treatments	Fruit weight	Fruit yield tree^−1	Fruit drop
	(g)	(kg)	(%)	Fruit juice pH
Copper sulfate levels (%)
0% (control)	156.71c	46.51c	11.97 a	4.88d
0.20%	166.04bc	50.55 bc	11.17ab	5.06c
0.40%	175.96ab	54.78ab	10.21b	5.15 bc
0.60%	192.04a	59.06a	6.75c	5.22 ab
0.80%	185.71a	57.86a	7.36c	5.31a
LSD at 5%	4.88	1.87	0.29	0.03
Potassium nitrate levels (%)
0% (control)	153.67 c	44.43c	11.02a	4.86d
2%	188.30a	67.13a	8.52c	5.23b
3%	187.20a	58.72a	8.63c	5.38a
LSD at 5%	3.90	1.50	0.23	0.02
Interaction
C.S X P. N	NS	NS	NS	NS

Mean values followed by different alphabets are significantly different at P ≤ 0.05, NS stands for non significant.

Table 2. Fruit firmness, total soluble solid, titratable acidity, ascorbic acid content, and disease incidence as affected by potassium nitrate and copper sulfate levels.

Treatments	Fruit firmness	Total soluble solid	Titratable acidity	Ascorbic acid content	Disease incidence
	(kg.cm^−2)	(^○Brix)	(%)	(mg.100 g^−1)	(%)
Copper sulfate level (%)
0% (control)	5,29d	9.94d	0.74a	4.71e	7.99 a
0.20%	6.13c	10.64c	0.54b	4.80d	7.26 b
0.40%	6.96b	10.83c	0.51c	4.91c	6.32 c
0.60%	7.11ab	11.52b	0.46d	5.10b	3.54 d
0.80%	7.53a	12.38a	0.42e	5.22a	3.99 d
LSD at 5%	0.1 2	0.17	0.009	0.02
Potassium nitrate level (%)
0% (control)	5.26d	9.79d	0.66a	4.47d	6.63a
1%	6.34c	10.46c	0.57b	4.73c	5.97b
2%	7.15b	11.60b	0.50c	5.05b	5.28c
3%	7.66a	12.40a	0.41d	5.56a	5.39c
LSD at 5%	0.10	0.13	0.007	0.02
Interaction
C.S X P. N	NS	NS	NS	NS	NS

Mean values followed by different alphabets are significantly different at P ≤ 0.05, NS stands for nonsignificant.