Application and Analysis of Rice-growth model for organic rice fert mgt

8/10/2019 Application and Analysis of Rice-growth model for organic rice fert mgt

1/30

IntroductionResearch Method

Results and analysisDiscussion

The application and analysis of rice-growth modelfor organic rice fertilization management (2008)

Yun-Guan Xi, Pei Qin, Gong-Hui Ding, Wui-Mei Fan, Cai-MingHan

4 September 2013

Yun-Guan XI et al. Application of rice-growth model for fertilization
http://find/


2/30



Chinese Eco-Agriculture

Aims at coordination between rural economic growth and

eco-environmental protection, exploitation and protection ofnatural resources

http://find/


3/30


4/30


5/30


6/30

Introduction


7/30



Organic Rice Growing

In China, rice is one of the main organically grown crops

The rational amount of organic fertilizer for organic rice

growing is the key technique and common question faced byfarmers

Too little input cannot meet nutrient requirement, but toomuch input will affect rice growth, pest/disease occurrence,

yield and production cost, and trigger agricultural non-pointpollution


Introduction
http://find/


8/30



Research Method

Rice Cultivation Computer Simulated Optimal Decision makingSystem (RCSODS)

established by Gao et al., 1992


Introduction
http://find/http://goback/


9/30



Research Method


established by Gao et al., 1992model especially designed for rice fertilization, so it is chosento calculate fertilization rate for organic rice growth andpredict yield


Introduction


10/30



Research Method


established by Gao et al., 1992model especially designed for rice fertilization, so it is chosento calculate fertilization rate for organic rice growth andpredict yield

field verification of organic rice growing in Shanghai YuejinFarm of Chongming Island


Introduction
http://find/


11/30

Research MethodResults and analysis

Discussion

To decide the optimal fertilization rate for rice growth (accordingto N requirement)

Calculation of soil N supply (NS)


Introduction
http://find/


12/30


Discussion


Calculation of soil N supply (NS)Calculation of N requirement (NR) of rice crop


Introduction
http://find/


13/30


Discussion


Calculation of soil N supply (NS)Calculation of N requirement (NR) of rice crop

Calculation of N application rate (FN)


Introduction
http://find/


14/30


Discussion


NS=TNAENQ(T30)/1010 0.08 2.25 10

6

where

TN - total N in soil

A - acreage of field under cultivation

EN- soil N supply efficiency; correction factor (%)

Q10 - temperature coefficient of mineralization of organic N inthe soil

T - mean temperature of the entire rice growing season

0.08 - ratio of mineralized N/total N

2.25 106 - dry weight (kg) of the soil in the surface layer


IntroductionR h M h d


15/30


Discussion


EN= 0.5 0.1FpH0.2FOMS

where FpH and FOMS is an influence function of the effect of pHand OMS on NS respectively


IntroductionR s h M th d
http://find/


16/30


Discussion

The soil of the experiment field is coastal desalinized soil 8.02 inpH, 22.7 g/kg in organic matter, and 1.60 g/kg in TN. ChongmingIsland has a mean temperature of 26.1C

FpH= 1.0FOMS= 0.419

EN= 0.316

NS= 77.78kg/hm2


http://find/


17/30


Discussion

Calculation of N requirement (NR) of rice crop

Based on the organic rice yield in the Yuejin Farm in 2001-2004,the targeted yield could be set as 7125kg/hm2 and the Nrequirement for 100kg grain could be set as 1.8kg; hence NRshould be 128.25kg/hm2




18/30


Discussion

Calculation of N application rate (FN)

FN=NR NSNGTR

ECwhere

NG - N content in the green manure

Tr - utilization efficiency

In the experiment, FN= 62.8kg


http://find/


19/30


Discussion

Verification of the model

A field experiment was carried out in Shanghai Yuejin Farm in

2005Samples of soil and green manure were collected

The experiment was designed to have 5 N treatments

Data were analyzed with the Duncan method using the SPSSsoftware


http://find/


20/30


Discussion

Prediction of yields under different fertilization


http://find/


21/30


Comparison of rice growth by treatments


http://find/


22/30


Comparison of rice growth by treatments




23/30


Comparison of pest/disease by treatments



R l d l i
http://find/


24/30


Comparison of pest/disease by treatments



R lt d l i
http://find/


25/30


Comparison of yield by treatments



Results and analysis
http://find/


26/30


Comparison of quality of rice grains by treatments



http://find/


27/30


Discussion

It is feasible to use the selected model to predict rice yield



http://find/


28/30


Discussion


There was little difference between the treatments in yield

although the net N application rate varied sharply between thetreatments



http://find/


29/30


Discussion




Pest/disease incidence was quite low in all treatments



http://find/


30/30

yDiscussion

Discussion




Pest/disease incidence was quite low in all treatments

Organic rice quality was quite stable and rarely impacted by

different N input levels

http://find/

Date post:	02-Jun-2018
Category:	Documents
Upload:	pinguuenrqz
View:	220 times
Download:	0 times

Application and Analysis of Rice-growth model for organic rice fert mgt

Documents