Nutritional status of citrus orchards in Sahiwal district [Pakistan]
2002
Ranjha, A.M. | Akram, M. (University of Agriculture, Faisalabad (Pakistan)) | Mehdi, S.M. | Sadiq, M. | Sarfraz, M. | Hassan, G.
A total of 100 soil and 75 plant samples were collected for determination of nutritional status of citrus orchards in Sahiwal. The results showed that 8% soil samples were deficient in N, 4% in P, no one in K, 100% in Zn and no one in Cu, Fe and Mn. The extent of nutrients belonging to low category has been found as 88% in N, 56% in P, no one in K, 84% in Cu and no one in Fe and Mn. In sufficiency range, 4% soil samples were sufficient in N, 24% in P, 64% in K, 16% in Cu and 100% in Fe and Mn contents. Among high range of nutrients only 16% soil samples in P and 35% in K were found. In case of leaf samples, 40% were deficient in N, 28% in Zn, no one in P, K, Fs, Cu and Mn while 24% were low in N, 60% in K, 68% in Zn and no one in P, Cu, Fe and Mn and 32% were sufficient in N, 68% in P, 40% in K, 4% in Zn, 100% in Cu, Fe and Mn contents while 4% were high in N and 32% in P. Soil pH had a non significant negative correlation with leaf N, P, K, Zn, Fe and Mn and non-significant positive correlation with Cu. Soil organic matter had a highly significant positive correlation with leaf N and non-significant negative correlation with K, Cu and Mn and non significant positive correlation with P, Ca + Mg, Zn and Fe contents. Clay contents had a significant positive correlation with K and non- significant positive correlation with P, Ca +Mg, Zn and negative correlation with N, Cu, Fe and Mn but non-significantly. A positive significant correlation was also found between soil N, Ca +Mg, Fe content and leaf N, Ca +Mg and soil P, K, Zn and Mn also had positive correlation with leaf P, K, Zn and Mn but non-significantly. Soil Cu had negative correlation with leaf Cu but non- significantly.
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