Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw

Managing rice straw (in term of K source) is essential if sustainability is to be achieved with a small amount of inorganic K fertilizer. About 80 % K taken up by rice crop (Oryza sativa L.) is in the straw. To increase efficiency of K utilization from the rice straw, it is essential to know the...

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Main Author:	Mulyadi
Format:	Thesis
Language:	English English
Published:	2000
Subjects:	Potassium Rice - Processing Rice straw
Online Access:	http://psasir.upm.edu.my/id/eprint/10534/1/FP_2000_22_A.pdf
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id	my-upm-ir.10534
record_format	uketd_dc
spelling	my-upm-ir.105342011-04-27T04:43:08Z Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw 2000-12 Mulyadi, Managing rice straw (in term of K source) is essential if sustainability is to be achieved with a small amount of inorganic K fertilizer. About 80 % K taken up by rice crop (Oryza sativa L.) is in the straw. To increase efficiency of K utilization from the rice straw, it is essential to know the K supplying characteristic and crop available K from the straw. Information of this kind may also help in a better understanding of K cycling in soil--crop system. Two experiments were conducted in a glasshouse. The first experiment, composting of rice straw, was to study the changes in tensile load of rice straw during rice straw composting, its possibility as an indicator for the state of decomposition and K released. The second experiment, a pot experiment using com (Zea mays L.) variety of PJ-58 as test crop for K uptake planted on Bungor series soil (Typic PaleuduJt), was firstly to evaluate the crop available K from composted (CRS) and uncomposted (UCRS) rice straw compared to that from Muriate of Potash (MOP) as standard K fertilizer and secondly to evaluate the use of tensile load of rice straw as an indicator to predict K released from UCRS incorporated in the soil, the crop K uptake and leaf K concentration. The results indicated that during composting of rice straw, the individual relationships between the percentage of organic matter remaining, the contents of total and water soluble K of decomposing rice straw with the tensile load of indicator rice straw are highly significant (P :s 0.01) with linear correlation coefficients of 0.97, - 0.96 and - 0.94, respectively. Therefore, tensile load of indicator rice straw can possibly be used as an alternative indicator for the state of decomposition of rice straw and to predict K released. Applications of MOP, CRS and VCRS to the soil increased K accumulated in com crop, total and exchangeable K contents of the soil, but their increase depends on the crop growth period, the K rate and availability of fertilizer applied. Compared to MOP and VCRS, the use of CRS is more beneficial in increasing the crop K, P and ea uptake and results in better crop growth. As a source of K, the K availability from CRS was more readily available than that from UCRS and MOP; however at 56 days after planting (tasseling stage) and a rate of 3 60 mg K porI (90 kg K ha-I), the crop available (uptake) K from the three K fertilizer sources were similar, ranging from 90.48 to 109.25 %. Tensile load of indicator rice straw can also possibly be used as indicator to predict K released from UCRS incorporated into the soil based on the correlation of tensile load and K content in the decomposing rice straw during composting. The trends are less applicable as indicator to predict the crop K uptake and leaf K concentration of com. Potassium Rice - Processing Rice straw 2000-12 Thesis http://psasir.upm.edu.my/id/eprint/10534/ http://psasir.upm.edu.my/id/eprint/10534/1/FP_2000_22_A.pdf application/pdf en public masters Universiti Putra Malaysia Potassium Rice - Processing Rice straw Faculty of Agriculture English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Potassium Rice - Processing Rice straw
spellingShingle	Potassium Rice - Processing Rice straw Mulyadi, Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw
description	Managing rice straw (in term of K source) is essential if sustainability is to be achieved with a small amount of inorganic K fertilizer. About 80 % K taken up by rice crop (Oryza sativa L.) is in the straw. To increase efficiency of K utilization from the rice straw, it is essential to know the K supplying characteristic and crop available K from the straw. Information of this kind may also help in a better understanding of K cycling in soil--crop system. Two experiments were conducted in a glasshouse. The first experiment, composting of rice straw, was to study the changes in tensile load of rice straw during rice straw composting, its possibility as an indicator for the state of decomposition and K released. The second experiment, a pot experiment using com (Zea mays L.) variety of PJ-58 as test crop for K uptake planted on Bungor series soil (Typic PaleuduJt), was firstly to evaluate the crop available K from composted (CRS) and uncomposted (UCRS) rice straw compared to that from Muriate of Potash (MOP) as standard K fertilizer and secondly to evaluate the use of tensile load of rice straw as an indicator to predict K released from UCRS incorporated in the soil, the crop K uptake and leaf K concentration. The results indicated that during composting of rice straw, the individual relationships between the percentage of organic matter remaining, the contents of total and water soluble K of decomposing rice straw with the tensile load of indicator rice straw are highly significant (P :s 0.01) with linear correlation coefficients of 0.97, - 0.96 and - 0.94, respectively. Therefore, tensile load of indicator rice straw can possibly be used as an alternative indicator for the state of decomposition of rice straw and to predict K released. Applications of MOP, CRS and VCRS to the soil increased K accumulated in com crop, total and exchangeable K contents of the soil, but their increase depends on the crop growth period, the K rate and availability of fertilizer applied. Compared to MOP and VCRS, the use of CRS is more beneficial in increasing the crop K, P and ea uptake and results in better crop growth. As a source of K, the K availability from CRS was more readily available than that from UCRS and MOP; however at 56 days after planting (tasseling stage) and a rate of 3 60 mg K porI (90 kg K ha-I), the crop available (uptake) K from the three K fertilizer sources were similar, ranging from 90.48 to 109.25 %. Tensile load of indicator rice straw can also possibly be used as indicator to predict K released from UCRS incorporated into the soil based on the correlation of tensile load and K content in the decomposing rice straw during composting. The trends are less applicable as indicator to predict the crop K uptake and leaf K concentration of com.
format	Thesis
qualification_level	Master's degree
author	Mulyadi,
author_facet	Mulyadi,
author_sort	Mulyadi,
title	Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw
title_short	Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw
title_full	Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw
title_fullStr	Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw
title_full_unstemmed	Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw
title_sort	potassium dynamic and availability from composted and uncomposted rice straw
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Agriculture
publishDate	2000
url	http://psasir.upm.edu.my/id/eprint/10534/1/FP_2000_22_A.pdf
_version_	1747811144761868288

Potassium Dynamic and Availability from Composted and Uncomposted Rice Straw

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