EFFECT OF SOIL ADDITION WITH RICE STRAW AND COTTON STALK ON THE PRODUCTIVITY OF PEA AND FOLLWED CROP

Abstract

A field experiments was conducted through 2010/2011 and 2011/2012 at a private farm, in Tokh Qaliubiya governorate, Egypt in clay soil texture, to determining the effect soil incorporation of rice straw and cotton residues alone or with mineral nitrogen or nitrogen fixer bacteria (Azotobacter, Azospirillium lipoforium and Bacillus polymyxa ) on growth yield and nutrients content of pea (Pisum Sativum L.) cultivar (master-B) and residual effect of residues on growth yield and nutrient content of okra crop (Abelmoschus esculentus L. Moench) cultivar (Dokki,cross1) as well as some soil chemical and nutrients content after harvesting of main and followed crops, compared with recommended dose of mineral fertilizers (N, P, K), Data showed that the treatment of recommended dose of chemical fertilizer produced the highest significant values of pod fresh weight g/ pea plant, pod weight (Kg)/fed., seed fresh weight (g)/ plant , seed yield (Kg)/fed., 100 seed weight (g), straw weight (g)/plant , straw yield (Kg)/fed, macro and micronutrients content of pea seed , straw and content of soil after harvest crop. While, the lowest ones were recorded by rice straw or cotton stalk incorporated alone as well as with N fixer or N mineral. Incorporation of rice straw may be responsible for rising EC, the highest value of Ec was achieved in 2ton rice straw/fed+ Nitrogen fixer bacteria, on the contrary the value of pH was reduced in most cases of treatment of residues. On the other hand, the effect of incorporation of raw material (rice straw or cotton stalk) showed a positive effect on okra plant, macro and micro content in okra pod, straw and content of soil (macro and micro nutrients). The residual effect of chemical fertilizer and rice straw as raw materials alone and with ammonium nitrate or nitrogen fixer bacteria increased significantly EC of soil after okra plant. Meanwhile, the lowest one was recorded when adding cotton stalk as raw materials alone and with Ammonium nitrate (AN) or Nitrogen fixer bacteria (NFB) for okra plant. In most cases, pH increased significantly by using the all treatments under study as a residual effect compared to the treatment of 1 ton rice straw (RS) alone. The treatment of ‎ 2 ton cotton stalk/fed+ Nitrogen fixer bacteria led to increase the value of organic matter and C/N ratio after harvesting crop. Key Words: Rice straw, Cotton Stalk, Mineral Fertilizers, Biofertilizer, Pea, Okra, Incorporation.