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Table 1 Residual soil phosphorous (P) and zinc (Zn), number of spikes m−2, number of grains spike−1, thousand grains weight and grain yield of wheat as affected by preceding rice genotypes, phosphorus and zinc levels under rice–wheat cropping system

From: Residual phosphorus and zinc influence wheat productivity under rice–wheat cropping system

Applied (kg P ha−1) Residual soil P (mg kg−1) Residual soil Zn (mg kg−1) Number of spikes m−2 Number of grains spike−1 Thousand grains weight (g) Grain yield (kg ha−1)
0 4.1 d 1.13 c 226 d 45 d 36.06 c 3434 d
40 8.1 c 1.20 b 256 c 49 c 39.08 b 3974 c
80 9.8 b 1.23 ab 282 b 51 b 40.46 a 4194 b
120 11.3 a 1.26 a 290 a 52 a 40.54 a 4291 a
LSD0.05 0.23 0.030 5.13 0.7 0.578 72.34
Applied Zn (kg ha−1)
 0 7.8 c 0.75 d 253 c 48 c 38.51 c 3800 c
 5 8.3 b 1.26 c 261 b 49 b 39.25 ab 3965 b
 10 8.4 b 1.37 b 268 a 50 a 39.53 a 4010 b
 15 8.8 a 1.44 a 271 a 50 a 38.86 bc 4118 a
LSD0.05 0.19 0.027 4.55 0.5 0.455 75.70
Rice genotypes
 Basmati-385 9.1 a 1.34 a 277 a 50 a 39.47 a 4234 a
 F-Malakand 8.1 b 1.19 b 270 b 50 a 39.19 a 4085 b
 Pukhraj 7.8 c 1.08 c 243 c 48 b 38.44 b 3601 c
LSD0.05 0.20 0.026 4.44 0.6 0.500 62.65
Years
 Year-I 7.9 b 1.17 b 261 a 49 b 38.73 b 3850 b
 Year-II 8.8 a 1.24 a 265 a 50 a 39.34 a 4097 a
P × Zn **Fig 2 **Fig 3 **Fig 4 **Fig 5 *Fig 6 ***Fig. 7
  1. Means of the same category followed by different letters are significantly different at 5 % level of probability using LSD test
  2. ns stands for non-significant, while *, ** and *** stands for significant at 5, 1 and 0.1 % level of probability, respectively