الفهرس 
1.INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This study was carried out as a pots experiment at a privet greenhouse of El-Emam El-hussin village, El-Delengat area, Behara Governerate Egypt to study the individual and combined treatment of salinity levels of irrigation water (300,700 and 1900 mg L-1),applying magnetic technique (un-and magnetized water) and biofertilization (without and with) on growth,root nodules formation and macro nutrients (N,P and K) contents of pea plants grown in clay and sandy soils at two growth periods.
To the aims of this study, Two soils varied in their physical and chemical properties were used in this study. The first soil was clay which taken from Gzeerit El-Hagar, El-Shohada, Minoufiya Governorate, and the second was sandy soil which taken from El-Emam El-Hussin village, El-Delengat area, Behaira Governorate. Initial physical and chemical properties for the two soils were done.
Also, three resources of irrigation water of Behaira Governorate varied in their salinity levels. The first one IW1 representing Nile water 300 mg/L taken from El-Emam El-Hussin village, ElBustan, El-Delengate, the second IW2 have salinity level of 700 mg L-1 representing ground water taken from the same village of the first resource. The third resources IW3 have a salinity level of 1900 mg L-1 representing also ground water of El-Tahawy village, Wadi El-Natroun. These three resources of irrigation water were magnetized by passing through a magnetic field (1000 Gows). The chemical composition of un-and magnetized irrigation water was done.
In addition, pea plants ( ) was used as a test plant was used as biofertilizer on two (800 g/fedane). The first one was added in powder form on the seeds (method) before planting, but the second was added in liquid form with irrigation water after 20 days of planting.
The layout of the experiment was a split-plot design of each soil in six replicates with the main plots arranged in a randomized completely block design. After 45 days of planting, the plants of each pot (one plant) was taken and divided into roots and shoots. Root nodules formed were counted and recorded. Fresh and dry weights of shoots were measured.
Also, shoots content of N,P and K were determined. At harvesting stage, the plants of other three replicates were taken and divided into straw and seeds. Dry matter yields of straw and seeds were measured as well as their contents of N,P and K were determined.
The obtained data may be summarized as follows.
Irrigation water properties
plant determination at the first growth period (45 days)
Increase salinity level of irrigation water resulted in a significant decrease in number of nodules formed on the roots of pea plants grown in clay and sandy soils.
On the other hand, irrigation using magnetized water as well as with biofertilization individually and in together resulted in a significant increases in the nodules formed on the roots of pea plants, where the highest number was found with the combined treatments. In addition, with the same treatment of the studied three factors, nodules number on the roots of pea plants grown in clay soil were higher than those formed on the roots of plants grown in sandy soil.
In clay and sandy soils, there are a significant decreases in freshand dry weights of shoots pea plants with the increase salinity level of irrigation water, while these weights increased significantly as a result of irrigation by magnetized water as well as with biofertilization on individually and in together. Also, with the same treatment, fresh and dry matter yields of pea plants (shoots) grown in clay soil were higher than those with the plants grown in sandy soil.
Macro nutrients (N, P and K) concentration (%) and uptake (mg/pot) of pea plants (shoots) at 45 old day decreased significantly with increase in salinity levels of un-and magnetized saline water. So, RCS ”Relative changes” (%) of these nutrients uptake affected by salinity level of irrigation water were negative and become more negative at high levels of salinity under clay and sandy soils conditions.
on the other hand using magnetized water in irrigation as well as biofertilization individually and in together resulted in a significant increases of N, P and K content (% and mg/pot) in the shoots of pea plants grown in clay and sandy soils. So, all RCM and RCB (%) of N, P and K uptake by pea plants affected by applying magnetic technique and biofertilization were positive especially in their combined treatments.
Plant determination at harvesting stage
Increasing salinity levels of un-and magnetized irrigation water resulted in a significant decrease the dry matter yields of straw and seeds of pea plants grown in clay and sandy soils. So, RCS (%) of straw and seeds dry matter yields were negative and become more negative at high salinity of irrigation water. Also, as shown from RCS values may be noted that, dry matter yields of straw appeared high decrease with the increase in salinity level of irrigation compared with that found with seeds dry matter yields.
On the other hand there are a significant increases in the dry matter yields of pea plants (straw and seeds) grown in clay and sandy soils using magnetized water for irrigation and biofertilizer application individually and in together. So, all RCM and RCB (%) of straw and seeds dry matter yields of pea plants were positive and their more positive in their combined treatments.
In both clay and sandy soils, with the same treatment of the studied three factors, N, P and K concentration (%) of seeds was higher than that in the straw while the uptake (mg/pot) of these nutrients by straw was higher than that found in the seeds. Also, at the same treatment of the studied three factors, N, P and K content (% and mg/pot) in straw and seeds of pea plants grown on clay soil were higher than those found in the sandy soil.
Macro nutrients (N, P and K) contents (% and mg/pot) in the straw and seeds of pea plants grown in clay and sandy soils decreased significantly with the increase salinity level of irrigation water. The rate of these decreases varied from straw to seeds and from soil to another as shown from the calculated RCS (%) of these nutrients uptake, where these values were negative.
In addition, using magnetized water in irrigation and biofertilizer application individually and in combination resulted in a significant increases of N, P and K contents (% and mg/pot) in straw and seeds of pea plants grown in clay and sandy soils. So, all RCM and RCB (%) of N, P and K uptake by straw and seeds of pea plants grown on clay and sandy soils affected by irrigation using magnetized water and biofertilizer application individually and in together were positive and their were more positive in the combined treatments of magnetized water and biofertilization.